Code Trang 404 Hiệu Ứng Đẹp

Demo

CSS:

@import url("https://fonts.googleapis.com/css?family=Lato|Russo+One");

.container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.container-star {
  background-image: linear-gradient(to bottom, #292256 0%, #8446cf 70%, #a871d6 100%);
}
.container-star:after {
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0) 40%, rgba(15, 10, 38, 0.2) 100%);
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
}

.star-1 {
  position: absolute;
  border-radius: 50%;
  background-color: #ffffff;
  -webkit-animation: twinkle 5s infinite ease-in-out;
          animation: twinkle 5s infinite ease-in-out;
}
.star-1:after {
  height: 100%;
  width: 100%;
  -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
  content: "";
  position: absolute;
  background-color: #fff;
  border-radius: 50%;
}
.star-1:before {
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.5) 0%, rgba(255, 255, 255, 0) 60%, rgba(255, 255, 255, 0) 100%);
  position: absolute;
  border-radius: 50%;
  content: "";
  top: -20%;
  left: -50%;
}

.star-1:nth-of-type(1) {
  top: 78vh;
  left: 44vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(1):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(2) {
  top: 94vh;
  left: 67vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-1:nth-of-type(2):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(3) {
  top: 41vh;
  left: 66vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-1:nth-of-type(3):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(4) {
  top: 72vh;
  left: 77vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-1:nth-of-type(4):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(5) {
  top: 14vh;
  left: 68vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(5):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(6) {
  top: 26vh;
  left: 79vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(6):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(7) {
  top: 28vh;
  left: 84vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-1:nth-of-type(7):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(8) {
  top: 42vh;
  left: 28vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-1:nth-of-type(8):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(9) {
  top: 7vh;
  left: 99vw;
  width: 7px;
  height: 2.3333333333px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-1:nth-of-type(9):before {
  width: 14px;
  height: 14px;
  top: -250%;
}

.star-1:nth-of-type(10) {
  top: 97vh;
  left: 76vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-1:nth-of-type(10):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(11) {
  top: 76vh;
  left: 89vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(11):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(12) {
  top: 16vh;
  left: 92vw;
  width: 8px;
  height: 2.6666666667px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-1:nth-of-type(12):before {
  width: 16px;
  height: 16px;
  top: -250%;
}

.star-1:nth-of-type(13) {
  top: 78vh;
  left: 33vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(13):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(14) {
  top: 12vh;
  left: 67vw;
  width: 7px;
  height: 2.3333333333px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(14):before {
  width: 14px;
  height: 14px;
  top: -250%;
}

.star-1:nth-of-type(15) {
  top: 64vh;
  left: 51vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(15):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(16) {
  top: 71vh;
  left: 95vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(16):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(17) {
  top: 56vh;
  left: 31vw;
  width: 7px;
  height: 2.3333333333px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-1:nth-of-type(17):before {
  width: 14px;
  height: 14px;
  top: -250%;
}

.star-1:nth-of-type(18) {
  top: 33vh;
  left: 80vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(18):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(19) {
  top: 30vh;
  left: 14vw;
  width: 8px;
  height: 2.6666666667px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(19):before {
  width: 16px;
  height: 16px;
  top: -250%;
}

.star-1:nth-of-type(20) {
  top: 53vh;
  left: 43vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-1:nth-of-type(20):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(21) {
  top: 32vh;
  left: 9vw;
  width: 7px;
  height: 2.3333333333px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-1:nth-of-type(21):before {
  width: 14px;
  height: 14px;
  top: -250%;
}

.star-1:nth-of-type(22) {
  top: 97vh;
  left: 9vw;
  width: 5px;
  height: 1.6666666667px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-1:nth-of-type(22):before {
  width: 10px;
  height: 10px;
  top: -250%;
}

.star-1:nth-of-type(23) {
  top: 62vh;
  left: 6vw;
  width: 5px;
  height: 1.6666666667px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(23):before {
  width: 10px;
  height: 10px;
  top: -250%;
}

.star-1:nth-of-type(24) {
  top: 57vh;
  left: 13vw;
  width: 9px;
  height: 3px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-1:nth-of-type(24):before {
  width: 18px;
  height: 18px;
  top: -250%;
}

.star-1:nth-of-type(25) {
  top: 52vh;
  left: 60vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(25):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(26) {
  top: 5vh;
  left: 84vw;
  width: 5px;
  height: 1.6666666667px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-1:nth-of-type(26):before {
  width: 10px;
  height: 10px;
  top: -250%;
}

.star-1:nth-of-type(27) {
  top: 26vh;
  left: 23vw;
  width: 8px;
  height: 2.6666666667px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(27):before {
  width: 16px;
  height: 16px;
  top: -250%;
}

.star-1:nth-of-type(28) {
  top: 34vh;
  left: 3vw;
  width: 4px;
  height: 1.3333333333px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(28):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-1:nth-of-type(29) {
  top: 40vh;
  left: 58vw;
  width: 6px;
  height: 2px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-1:nth-of-type(29):before {
  width: 12px;
  height: 12px;
  top: -250%;
}

.star-1:nth-of-type(30) {
  top: 17vh;
  left: 55vw;
  width: 5px;
  height: 1.6666666667px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-1:nth-of-type(30):before {
  width: 10px;
  height: 10px;
  top: -250%;
}

.star-2 {
  position: absolute;
  border-radius: 50%;
  background-color: #ffffff;
  -webkit-animation: twinkle 5s infinite ease-in-out;
          animation: twinkle 5s infinite ease-in-out;
}

.star-2:nth-of-type(31) {
  top: 70vh;
  left: 96vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(31):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(32) {
  top: 88vh;
  left: 57vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-2:nth-of-type(32):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(33) {
  top: 59vh;
  left: 48vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(33):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(34) {
  top: 2vh;
  left: 83vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(34):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(35) {
  top: 8vh;
  left: 75vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(35):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(36) {
  top: 78vh;
  left: 8vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-2:nth-of-type(36):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(37) {
  top: 72vh;
  left: 98vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(37):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(38) {
  top: 34vh;
  left: 41vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-2:nth-of-type(38):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(39) {
  top: 13vh;
  left: 5vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(39):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(40) {
  top: 5vh;
  left: 86vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-2:nth-of-type(40):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(41) {
  top: 7vh;
  left: 62vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(41):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(42) {
  top: 36vh;
  left: 44vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(42):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(43) {
  top: 74vh;
  left: 47vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-2:nth-of-type(43):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(44) {
  top: 72vh;
  left: 86vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-2:nth-of-type(44):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(45) {
  top: 26vh;
  left: 40vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(45):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(46) {
  top: 41vh;
  left: 39vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(46):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(47) {
  top: 16vh;
  left: 36vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-2:nth-of-type(47):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(48) {
  top: 96vh;
  left: 37vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(48):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(49) {
  top: 18vh;
  left: 8vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-2:nth-of-type(49):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(50) {
  top: 56vh;
  left: 31vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}
.star-2:nth-of-type(50):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(51) {
  top: 24vh;
  left: 69vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(51):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(52) {
  top: 52vh;
  left: 17vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(52):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(53) {
  top: 35vh;
  left: 59vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(53):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(54) {
  top: 46vh;
  left: 73vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(54):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(55) {
  top: 38vh;
  left: 35vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-2:nth-of-type(55):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(56) {
  top: 34vh;
  left: 66vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.star-2:nth-of-type(56):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(57) {
  top: 80vh;
  left: 76vw;
  width: 3px;
  height: 3px;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}
.star-2:nth-of-type(57):before {
  width: 6px;
  height: 6px;
  top: -250%;
}

.star-2:nth-of-type(58) {
  top: 45vh;
  left: 49vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(58):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.star-2:nth-of-type(59) {
  top: 8vh;
  left: 4vw;
  width: 4px;
  height: 4px;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.star-2:nth-of-type(59):before {
  width: 8px;
  height: 8px;
  top: -250%;
}

.star-2:nth-of-type(60) {
  top: 71vh;
  left: 93vw;
  width: 2px;
  height: 2px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
}
.star-2:nth-of-type(60):before {
  width: 4px;
  height: 4px;
  top: -250%;
}

.container-title {
  width: 600px;
  height: 450px;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  position: absolute;
  color: white;
  line-height: 1;
  font-weight: 700;
  text-align: center;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  display: flex;
}

.title > * {
  display: inline-block;
  font-size: 200px;
}

.number {
  text-shadow: 20px 20px 20px rgba(0, 0, 0, 0.2);
  padding: 0 0.2em;
  font-family: 'Russo One', sans-serif;
}

.subtitle {
  font-size: 25px;
  margin-top: 1.5em;
  font-family: "Lato", sans-serif;
  text-shadow: 4px 4px 4px rgba(0, 0, 0, 0.2);
}

button {
  font-size: 22px;
  margin-top: 1.5em;
  padding: 0.5em 1em;
  letter-spacing: 1px;
  font-family: "Lato", sans-serif;
  color: white;
  background-color: transparent;
  border: 0;
  cursor: pointer;
  z-index: 999;
  border: 2px solid white;
  border-radius: 5px;
  text-shadow: 4px 4px 4px rgba(0, 0, 0, 0.2);
  transition: opacity 0.2s ease;
}
button:hover {
  opacity: 0.7;
}
button:focus {
  outline: 0;
}

.moon {
  position: relative;
  border-radius: 50%;
  width: 160px;
  height: 160px;
  z-index: 2;
  background-color: #fff;
  box-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #fff, 0 0 70px #fff, 0 0 80px #fff, 0 0 100px #ff1177;
  -webkit-animation: rotate 5s ease-in-out infinite;
          animation: rotate 5s ease-in-out infinite;
}
.moon .face {
  top: 60%;
  left: 47%;
  position: absolute;
}
.moon .face .mouth {
  border-top-left-radius: 50%;
  border-bottom-right-radius: 50%;
  border-top-right-radius: 50%;
  background-color: #5c3191;
  width: 25px;
  height: 25px;
  position: absolute;
  -webkit-animation: snore 5s ease-in-out infinite;
          animation: snore 5s ease-in-out infinite;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
  box-shadow: inset -4px -4px 4px rgba(0, 0, 0, 0.3);
}
.moon .face .eyes {
  position: absolute;
  top: -30px;
  left: -30px;
}
.moon .face .eyes .eye-left,
.moon .face .eyes .eye-right {
  border: 4px solid #5c3191;
  width: 30px;
  height: 15px;
  border-bottom-left-radius: 100px;
  border-bottom-right-radius: 100px;
  border-top: 0;
  position: absolute;
}
.moon .face .eyes .eye-left:before, .moon .face .eyes .eye-left:after,
.moon .face .eyes .eye-right:before,
.moon .face .eyes .eye-right:after {
  content: "";
  position: absolute;
  border-radius: 50%;
  width: 4px;
  height: 4px;
  background-color: #5c3191;
  top: -2px;
  left: -4px;
}
.moon .face .eyes .eye-left:after,
.moon .face .eyes .eye-right:after {
  left: auto;
  right: -4px;
}
.moon .face .eyes .eye-right {
  left: 50px;
}

.container-bird {
  -webkit-perspective: 2000px;
          perspective: 2000px;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

.bird {
  position: absolute;
  z-index: 1000;
  left: 50%;
  top: 50%;
  height: 40px;
  width: 50px;
  -webkit-transform: translate3d(-100vw, 0, 0) rotateY(90deg);
          transform: translate3d(-100vw, 0, 0) rotateY(90deg);
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
}

.bird-container {
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  -webkit-transform: translate3d(50px, 30px, -300px);
          transform: translate3d(50px, 30px, -300px);
}

.wing {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  border-radius: 3px;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  -webkit-transform-origin: center bottom;
          transform-origin: center bottom;
  z-index: 300;
}

.wing-left {
  background: linear-gradient(to bottom, #a58dc4 0%, #7979a8 100%);
  -webkit-transform: translate3d(0, 0, 0) rotateX(-30deg);
          transform: translate3d(0, 0, 0) rotateX(-30deg);
  -webkit-animation: wingLeft 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
          animation: wingLeft 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}

.wing-right {
  background: linear-gradient(to bottom, #d9d3e2 0%, #b8a5d1 100%);
  -webkit-transform: translate3d(0, 0, 0) rotateX(-30deg);
          transform: translate3d(0, 0, 0) rotateX(-30deg);
  -webkit-animation: wingRight 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
          animation: wingRight 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}

.wing-right-top,
.wing-left-top {
  border-right: 25px solid transparent;
  border-left: 25px solid transparent;
  top: -20px;
  width: 100%;
  position: absolute;
  -webkit-transform-origin: 100% 100%;
          transform-origin: 100% 100%;
}

.wing-right-top {
  border-bottom: 20px solid #b8a5d1;
  -webkit-transform: translate3d(0, 0, 0) rotateX(60deg);
          transform: translate3d(0, 0, 0) rotateX(60deg);
  -webkit-animation: wingRightTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
          animation: wingRightTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}

.wing-left-top {
  border-bottom: 20px solid #7979a8;
  -webkit-transform: translate3d(0, 0, 0) rotateX(-60deg);
          transform: translate3d(0, 0, 0) rotateX(-60deg);
  -webkit-animation: wingLeftTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
          animation: wingLeftTop 1.3s cubic-bezier(0.45, 0, 0.5, 0.95) infinite;
}

.bird-anim:nth-child(1) {
  -webkit-animation: bird1 30s linear infinite forwards;
          animation: bird1 30s linear infinite forwards;
}

.bird-anim:nth-child(2) {
  -webkit-animation: bird2 30s linear infinite forwards;
          animation: bird2 30s linear infinite forwards;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
  z-index: -1;
}

.bird-anim:nth-child(3) {
  -webkit-animation: bird3 30s linear infinite forwards;
          animation: bird3 30s linear infinite forwards;
  -webkit-animation-delay: 5s;
          animation-delay: 5s;
}

.bird-anim:nth-child(4) {
  -webkit-animation: bird4 30s linear infinite forwards;
          animation: bird4 30s linear infinite forwards;
  -webkit-animation-delay: 7s;
          animation-delay: 7s;
}

.bird-anim:nth-child(5) {
  -webkit-animation: bird5 30s linear infinite forwards;
          animation: bird5 30s linear infinite forwards;
  -webkit-animation-delay: 14s;
          animation-delay: 14s;
}

.bird-anim:nth-child(6) {
  -webkit-animation: bird6 30s linear infinite forwards;
          animation: bird6 30s linear infinite forwards;
  -webkit-animation-delay: 10s;
          animation-delay: 10s;
  z-index: -1;
}

@-webkit-keyframes rotate {
  0%, 100% {
    -webkit-transform: rotate(-8deg);
            transform: rotate(-8deg);
  }
  50% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
}

@keyframes rotate {
  0%, 100% {
    -webkit-transform: rotate(-8deg);
            transform: rotate(-8deg);
  }
  50% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
}
@-webkit-keyframes snore {
  0%, 100% {
    -webkit-transform: scale(1) rotate(30deg);
            transform: scale(1) rotate(30deg);
  }
  50% {
    -webkit-transform: scale(0.5) rotate(30deg);
            transform: scale(0.5) rotate(30deg);
    border-bottom-left-radius: 50%;
  }
}
@keyframes snore {
  0%, 100% {
    -webkit-transform: scale(1) rotate(30deg);
            transform: scale(1) rotate(30deg);
  }
  50% {
    -webkit-transform: scale(0.5) rotate(30deg);
            transform: scale(0.5) rotate(30deg);
    border-bottom-left-radius: 50%;
  }
}
@-webkit-keyframes twinkle {
  0%, 100% {
    opacity: 0.7;
  }
  50% {
    opacity: 0.3;
  }
}
@keyframes twinkle {
  0%, 100% {
    opacity: 0.7;
  }
  50% {
    opacity: 0.3;
  }
}
@-webkit-keyframes wingLeft {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(-50deg);
            transform: translate3d(0, 0, 0) rotateX(-50deg);
  }
  50% {
    -webkit-transform: translate3d(0, -20px, 0) rotateX(-130deg);
            transform: translate3d(0, -20px, 0) rotateX(-130deg);
    background: linear-gradient(to bottom, #d9d3e2 0%, #b8a5d1 100%);
  }
}
@keyframes wingLeft {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(-50deg);
            transform: translate3d(0, 0, 0) rotateX(-50deg);
  }
  50% {
    -webkit-transform: translate3d(0, -20px, 0) rotateX(-130deg);
            transform: translate3d(0, -20px, 0) rotateX(-130deg);
    background: linear-gradient(to bottom, #d9d3e2 0%, #b8a5d1 100%);
  }
}
@-webkit-keyframes wingLeftTop {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(-10deg);
            transform: translate3d(0, 0, 0) rotateX(-10deg);
  }
  50% {
    -webkit-transform: translate3d(0px, 0px, 0) rotateX(-40deg);
            transform: translate3d(0px, 0px, 0) rotateX(-40deg);
    border-bottom: 20px solid #b8a5d1;
  }
}
@keyframes wingLeftTop {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(-10deg);
            transform: translate3d(0, 0, 0) rotateX(-10deg);
  }
  50% {
    -webkit-transform: translate3d(0px, 0px, 0) rotateX(-40deg);
            transform: translate3d(0px, 0px, 0) rotateX(-40deg);
    border-bottom: 20px solid #b8a5d1;
  }
}
@-webkit-keyframes wingRight {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(50deg);
            transform: translate3d(0, 0, 0) rotateX(50deg);
  }
  50% {
    -webkit-transform: translate3d(0, -20px, 0) rotateX(130deg);
            transform: translate3d(0, -20px, 0) rotateX(130deg);
    background: linear-gradient(to bottom, #a58dc4 0%, #7979a8 100%);
  }
}
@keyframes wingRight {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(50deg);
            transform: translate3d(0, 0, 0) rotateX(50deg);
  }
  50% {
    -webkit-transform: translate3d(0, -20px, 0) rotateX(130deg);
            transform: translate3d(0, -20px, 0) rotateX(130deg);
    background: linear-gradient(to bottom, #a58dc4 0%, #7979a8 100%);
  }
}
@-webkit-keyframes wingRightTop {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(10deg);
            transform: translate3d(0, 0, 0) rotateX(10deg);
  }
  50% {
    -webkit-transform: translate3d(0px, 0px, 0px) rotateX(40deg);
            transform: translate3d(0px, 0px, 0px) rotateX(40deg);
    border-bottom: 20px solid #7979a8;
  }
}
@keyframes wingRightTop {
  0%, 100% {
    -webkit-transform: translate3d(0, 0, 0) rotateX(10deg);
            transform: translate3d(0, 0, 0) rotateX(10deg);
  }
  50% {
    -webkit-transform: translate3d(0px, 0px, 0px) rotateX(40deg);
            transform: translate3d(0px, 0px, 0px) rotateX(40deg);
    border-bottom: 20px solid #7979a8;
  }
}
@-webkit-keyframes bird1 {
  0% {
    -webkit-transform: translate3d(-120vw, -20px, -1000px) rotateY(-40deg) rotateX(0deg);
            transform: translate3d(-120vw, -20px, -1000px) rotateY(-40deg) rotateX(0deg);
  }
  100% {
    -webkit-transform: translate3d(100vw, -40vh, 1000px) rotateY(-40deg) rotateX(0deg);
            transform: translate3d(100vw, -40vh, 1000px) rotateY(-40deg) rotateX(0deg);
  }
}
@keyframes bird1 {
  0% {
    -webkit-transform: translate3d(-120vw, -20px, -1000px) rotateY(-40deg) rotateX(0deg);
            transform: translate3d(-120vw, -20px, -1000px) rotateY(-40deg) rotateX(0deg);
  }
  100% {
    -webkit-transform: translate3d(100vw, -40vh, 1000px) rotateY(-40deg) rotateX(0deg);
            transform: translate3d(100vw, -40vh, 1000px) rotateY(-40deg) rotateX(0deg);
  }
}
@-webkit-keyframes bird2 {
  0%,
	15% {
    -webkit-transform: translate3d(100vw, -300px, -1000px) rotateY(10deg) rotateX(0deg);
            transform: translate3d(100vw, -300px, -1000px) rotateY(10deg) rotateX(0deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -20px, -1000px) rotateY(10deg) rotateX(0deg);
            transform: translate3d(-100vw, -20px, -1000px) rotateY(10deg) rotateX(0deg);
  }
}
@keyframes bird2 {
  0%,
	15% {
    -webkit-transform: translate3d(100vw, -300px, -1000px) rotateY(10deg) rotateX(0deg);
            transform: translate3d(100vw, -300px, -1000px) rotateY(10deg) rotateX(0deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -20px, -1000px) rotateY(10deg) rotateX(0deg);
            transform: translate3d(-100vw, -20px, -1000px) rotateY(10deg) rotateX(0deg);
  }
}
@-webkit-keyframes bird3 {
  0% {
    -webkit-transform: translate3d(100vw, -50vh, 100px) rotateY(-5deg) rotateX(-20deg);
            transform: translate3d(100vw, -50vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -10vh, 100px) rotateY(-5deg) rotateX(-20deg);
            transform: translate3d(-100vw, -10vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
}
@keyframes bird3 {
  0% {
    -webkit-transform: translate3d(100vw, -50vh, 100px) rotateY(-5deg) rotateX(-20deg);
            transform: translate3d(100vw, -50vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -10vh, 100px) rotateY(-5deg) rotateX(-20deg);
            transform: translate3d(-100vw, -10vh, 100px) rotateY(-5deg) rotateX(-20deg);
  }
}
@-webkit-keyframes bird4 {
  0% {
    -webkit-transform: translate3d(100vw, 30vh, 200px) rotateY(-5deg) rotateX(10deg);
            transform: translate3d(100vw, 30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -30vh, 200px) rotateY(-5deg) rotateX(10deg);
            transform: translate3d(-100vw, -30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
}
@keyframes bird4 {
  0% {
    -webkit-transform: translate3d(100vw, 30vh, 200px) rotateY(-5deg) rotateX(10deg);
            transform: translate3d(100vw, 30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, -30vh, 200px) rotateY(-5deg) rotateX(10deg);
            transform: translate3d(-100vw, -30vh, 200px) rotateY(-5deg) rotateX(10deg);
  }
}
@-webkit-keyframes bird5 {
  0%,
	5% {
    -webkit-transform: translate3d(100vw, 30vh, 400px) rotateY(-15deg) rotateX(-10deg);
            transform: translate3d(100vw, 30vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, 10vh, 400px) rotateY(-15deg) rotateX(-10deg);
            transform: translate3d(-100vw, 10vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
}
@keyframes bird5 {
  0%,
	5% {
    -webkit-transform: translate3d(100vw, 30vh, 400px) rotateY(-15deg) rotateX(-10deg);
            transform: translate3d(100vw, 30vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
  100% {
    -webkit-transform: translate3d(-100vw, 10vh, 400px) rotateY(-15deg) rotateX(-10deg);
            transform: translate3d(-100vw, 10vh, 400px) rotateY(-15deg) rotateX(-10deg);
  }
}
@-webkit-keyframes bird6 {
  0%, 10% {
    -webkit-transform: translate3d(-100vw, 20vh, -500px) rotateY(15deg) rotateX(10deg);
            transform: translate3d(-100vw, 20vh, -500px) rotateY(15deg) rotateX(10deg);
  }
  100% {
    -webkit-transform: translate3d(100vw, 40vh, -800px) rotateY(5deg) rotateX(10deg);
            transform: translate3d(100vw, 40vh, -800px) rotateY(5deg) rotateX(10deg);
  }
}
@keyframes bird6 {
  0%, 10% {
    -webkit-transform: translate3d(-100vw, 20vh, -500px) rotateY(15deg) rotateX(10deg);
            transform: translate3d(-100vw, 20vh, -500px) rotateY(15deg) rotateX(10deg);
  }
  100% {
    -webkit-transform: translate3d(100vw, 40vh, -800px) rotateY(5deg) rotateX(10deg);
            transform: translate3d(100vw, 40vh, -800px) rotateY(5deg) rotateX(10deg);
  }
}
@media screen and (max-width: 580px) {
  .container-404 {
    width: 100%;
  }

  .number {
    font-size: 100px;
  }

  .subtitle {
    font-size: 20px;
    padding: 0 1em;
  }

  .moon {
    width: 100px;
    height: 100px;
  }

  .face {
    -webkit-transform: scale(0.7);
            transform: scale(0.7);
  }
}

Code Trang 404:

<div class="container container-star">
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-1"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
  <div class="star-2"></div>
</div>
<div class="container container-bird">
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="bird bird-anim">
    <div class="bird-container">
      <div class="wing wing-left">
        <div class="wing-left-top"></div>
      </div>
      <div class="wing wing-right">
        <div class="wing-right-top"></div>
      </div>
    </div>
  </div>
  <div class="container-title">
    <div class="title">
      <div class="number">4</div>
      <div class="moon">
        <div class="face">
          <div class="mouth"></div>
          <div class="eyes">
            <div class="eye-left"></div>
            <div class="eye-right"></div>
          </div>
        </div>
      </div>
      <div class="number">4</div>
    </div>
    <div class="subtitle">Page Not Found</div>
    <button>Trang Chủ</button>
  </div>
</div>

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