404.css

.number {
font-size: 80px;
 color: #666;
font-weight: bold;
}

body {
  margin: 0;
  font-size: 20px;
}

* {
  box-sizing: border-box;
}

.container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: white;
  color: black;
  font-family: arial, sans-serif;
  overflow: hidden;
}

.content {
  position: relative;
  width: 600px;
  max-width: 100%;
  margin: 20px;
  background: white;
  padding: 60px 40px;
  text-align: center;
  box-shadow: -10px 10px 67px -12px rgba(0, 0, 0, 0.2);
  opacity: 0;
  animation: apparition 0.8s 0.5s cubic-bezier(0.39, 0.575, 0.28, 0.995) forwards;
}
.content p {
  font-size: 1.3rem;
  margin-top: 0;
  margin-bottom: 0.6rem;
  letter-spacing: 0.1rem;
  color: #595959;
}
.content p:last-child {
  margin-bottom: 0;
}
.content button {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.5rem 1rem;
  border: 3px solid #595959;
  background: transparent;
  font-size: 1rem;
  color: #595959;
  text-decoration: none;
  cursor: pointer;
  font-weight: bold;
}

.particle {
  position: absolute;
  display: block;
  pointer-events: none;
}
.particle:nth-child(1) {
  top: 25.3968253968%;
  left: 93.2286555447%;
  font-size: 19px;
  filter: blur(0.02px);
  animation: 28s float2 infinite;
}
.particle:nth-child(2) {
  top: 19.536019536%;
  left: 70.6575073602%;
  font-size: 19px;
  filter: blur(0.04px);
  animation: 22s floatReverse2 infinite;
}
.particle:nth-child(3) {
  top: 81.2575574365%;
  left: 73.0282375852%;
  font-size: 27px;
  filter: blur(0.06px);
  animation: 28s floatReverse2 infinite;
}
.particle:nth-child(4) {
  top: 95.2147239264%;
  left: 28.5714285714%;
  font-size: 15px;
  filter: blur(0.08px);
  animation: 22s float2 infinite;
}
.particle:nth-child(5) {
  top: 87.1670702179%;
  left: 48.7329434698%;
  font-size: 26px;
  filter: blur(0.1px);
  animation: 33s float infinite;
}
.particle:nth-child(6) {
  top: 89.6551724138%;
  left: 20.7509881423%;
  font-size: 12px;
  filter: blur(0.12px);
  animation: 38s float infinite;
}
.particle:nth-child(7) {
  top: 34.5252774353%;
  left: 32.6409495549%;
  font-size: 11px;
  filter: blur(0.14px);
  animation: 29s float infinite;
}
.particle:nth-child(8) {
  top: 34.188034188%;
  left: 70.6575073602%;
  font-size: 19px;
  filter: blur(0.16px);
  animation: 22s float2 infinite;
}
.particle:nth-child(9) {
  top: 10.7843137255%;
  left: 1.968503937%;
  font-size: 16px;
  filter: blur(0.18px);
  animation: 31s float2 infinite;
}
.particle:nth-child(10) {
  top: 12.7450980392%;
  left: 0.9842519685%;
  font-size: 16px;
  filter: blur(0.2px);
  animation: 34s float2 infinite;
}
.particle:nth-child(11) {
  top: 75.3977968176%;
  left: 56.0471976401%;
  font-size: 17px;
  filter: blur(0.22px);
  animation: 35s floatReverse2 infinite;
}
.particle:nth-child(12) {
  top: 79.322853688%;
  left: 43.8169425511%;
  font-size: 27px;
  filter: blur(0.24px);
  animation: 25s float2 infinite;
}
.particle:nth-child(13) {
  top: 16.52490887%;
  left: 76.2463343109%;
  font-size: 23px;
  filter: blur(0.26px);
  animation: 34s floatReverse infinite;
}
.particle:nth-child(14) {
  top: 36.3190184049%;
  left: 44.3349753695%;
  font-size: 15px;
  filter: blur(0.28px);
  animation: 38s floatReverse2 infinite;
}
.particle:nth-child(15) {
  top: 41.6464891041%;
  left: 16.5692007797%;
  font-size: 26px;
  filter: blur(0.3px);
  animation: 39s floatReverse infinite;
}
.particle:nth-child(16) {
  top: 91.7073170732%;
  left: 93.137254902%;
  font-size: 20px;
  filter: blur(0.32px);
  animation: 26s float infinite;
}
.particle:nth-child(17) {
  top: 86.7469879518%;
  left: 94.1747572816%;
  font-size: 30px;
  filter: blur(0.34px);
  animation: 40s floatReverse infinite;
}
.particle:nth-child(18) {
  top: 81.2729498164%;
  left: 20.6489675516%;
  font-size: 17px;
  filter: blur(0.36px);
  animation: 40s float2 infinite;
}
.particle:nth-child(19) {
  top: 38.4236453202%;
  left: 10.8695652174%;
  font-size: 12px;
  filter: blur(0.38px);
  animation: 30s float infinite;
}
.particle:nth-child(20) {
  top: 82.2249093108%;
  left: 73.0282375852%;
  font-size: 27px;
  filter: blur(0.4px);
  animation: 26s floatReverse2 infinite;
}
.particle:nth-child(21) {
  top: 3.8787878788%;
  left: 38.0487804878%;
  font-size: 25px;
  filter: blur(0.42px);
  animation: 30s float infinite;
}
.particle:nth-child(22) {
  top: 46.6585662211%;
  left: 60.6060606061%;
  font-size: 23px;
  filter: blur(0.44px);
  animation: 34s floatReverse infinite;
}
.particle:nth-child(23) {
  top: 55.9509202454%;
  left: 76.8472906404%;
  font-size: 15px;
  filter: blur(0.46px);
  animation: 39s float2 infinite;
}
.particle:nth-child(24) {
  top: 4.9321824908%;
  left: 83.0860534125%;
  font-size: 11px;
  filter: blur(0.48px);
  animation: 23s float infinite;
}
.particle:nth-child(25) {
  top: 42.3124231242%;
  left: 13.8203356367%;
  font-size: 13px;
  filter: blur(0.5px);
  animation: 29s float infinite;
}
.particle:nth-child(26) {
  top: 72.6380368098%;
  left: 15.763546798%;
  font-size: 15px;
  filter: blur(0.52px);
  animation: 31s floatReverse infinite;
}
.particle:nth-child(27) {
  top: 67.6328502415%;
  left: 40.8560311284%;
  font-size: 28px;
  filter: blur(0.54px);
  animation: 29s floatReverse2 infinite;
}
.particle:nth-child(28) {
  top: 49.156626506%;
  left: 62.1359223301%;
  font-size: 30px;
  filter: blur(0.56px);
  animation: 28s float infinite;
}
.particle:nth-child(29) {
  top: 16.7076167076%;
  left: 28.5996055227%;
  font-size: 14px;
  filter: blur(0.58px);
  animation: 26s floatReverse infinite;
}
.particle:nth-child(30) {
  top: 68.8484848485%;
  left: 96.5853658537%;
  font-size: 25px;
  filter: blur(0.6px);
  animation: 22s floatReverse2 infinite;
}
.particle:nth-child(31) {
  top: 76.0048721072%;
  left: 21.5475024486%;
  font-size: 21px;
  filter: blur(0.62px);
  animation: 27s floatReverse2 infinite;
}
.particle:nth-child(32) {
  top: 61.7647058824%;
  left: 0.9842519685%;
  font-size: 16px;
  filter: blur(0.64px);
  animation: 39s float infinite;
}
.particle:nth-child(33) {
  top: 38.7878787879%;
  left: 43.9024390244%;
  font-size: 25px;
  filter: blur(0.66px);
  animation: 29s floatReverse infinite;
}
.particle:nth-child(34) {
  top: 62.1454993835%;
  left: 59.3471810089%;
  font-size: 11px;
  filter: blur(0.68px);
  animation: 35s float infinite;
}
.particle:nth-child(35) {
  top: 89.4348894349%;
  left: 28.5996055227%;
  font-size: 14px;
  filter: blur(0.7px);
  animation: 36s floatReverse infinite;
}
.particle:nth-child(36) {
  top: 36.803874092%;
  left: 82.8460038986%;
  font-size: 26px;
  filter: blur(0.72px);
  animation: 35s floatReverse infinite;
}
.particle:nth-child(37) {
  top: 63.4920634921%;
  left: 50.0490677134%;
  font-size: 19px;
  filter: blur(0.74px);
  animation: 28s floatReverse infinite;
}
.particle:nth-child(38) {
  top: 71.9319562576%;
  left: 92.8641251222%;
  font-size: 23px;
  filter: blur(0.76px);
  animation: 30s float infinite;
}
.particle:nth-child(39) {
  top: 36.4532019704%;
  left: 26.6798418972%;
  font-size: 12px;
  filter: blur(0.78px);
  animation: 39s float2 infinite;
}
.particle:nth-child(40) {
  top: 54.1062801932%;
  left: 78.7937743191%;
  font-size: 28px;
  filter: blur(0.8px);
  animation: 30s float infinite;
}
.particle:nth-child(41) {
  top: 81.2575574365%;
  left: 69.1333982473%;
  font-size: 27px;
  filter: blur(0.82px);
  animation: 35s float2 infinite;
}
.particle:nth-child(42) {
  top: 87.7108433735%;
  left: 35.9223300971%;
  font-size: 30px;
  filter: blur(0.84px);
  animation: 24s float2 infinite;
}
.particle:nth-child(43) {
  top: 75.7281553398%;
  left: 30.2734375%;
  font-size: 24px;
  filter: blur(0.86px);
  animation: 27s floatReverse2 infinite;
}
.particle:nth-child(44) {
  top: 9.8039215686%;
  left: 57.0866141732%;
  font-size: 16px;
  filter: blur(0.88px);
  animation: 36s floatReverse2 infinite;
}
.particle:nth-child(45) {
  top: 49.5145631068%;
  left: 5.859375%;
  font-size: 24px;
  filter: blur(0.9px);
  animation: 37s floatReverse infinite;
}
.particle:nth-child(46) {
  top: 58.9371980676%;
  left: 36.9649805447%;
  font-size: 28px;
  filter: blur(0.92px);
  animation: 32s float infinite;
}
.particle:nth-child(47) {
  top: 56.3791008505%;
  left: 31.2805474096%;
  font-size: 23px;
  filter: blur(0.94px);
  animation: 36s floatReverse2 infinite;
}
.particle:nth-child(48) {
  top: 32.3529411765%;
  left: 29.5275590551%;
  font-size: 16px;
  filter: blur(0.96px);
  animation: 22s floatReverse2 infinite;
}
.particle:nth-child(49) {
  top: 43.3734939759%;
  left: 90.2912621359%;
  font-size: 30px;
  filter: blur(0.98px);
  animation: 24s floatReverse2 infinite;
}
.particle:nth-child(50) {
  top: 6.7714631197%;
  left: 55.5014605648%;
  font-size: 27px;
  filter: blur(1px);
  animation: 39s floatReverse2 infinite;
}
.particle:nth-child(51) {
  top: 41.9512195122%;
  left: 19.6078431373%;
  font-size: 20px;
  filter: blur(1.02px);
  animation: 23s floatReverse infinite;
}
.particle:nth-child(52) {
  top: 55.1390568319%;
  left: 92.5024342746%;
  font-size: 27px;
  filter: blur(1.04px);
  animation: 30s float infinite;
}
.particle:nth-child(53) {
  top: 49.3946731235%;
  left: 30.2144249513%;
  font-size: 26px;
  filter: blur(1.06px);
  animation: 35s floatReverse infinite;
}
.particle:nth-child(54) {
  top: 15.763546798%;
  left: 4.9407114625%;
  font-size: 12px;
  filter: blur(1.08px);
  animation: 35s floatReverse infinite;
}
.particle:nth-child(55) {
  top: 94.403892944%;
  left: 87.084148728%;
  font-size: 22px;
  filter: blur(1.1px);
  animation: 28s floatReverse2 infinite;
}
.particle:nth-child(56) {
  top: 80.490797546%;
  left: 46.3054187192%;
  font-size: 15px;
  filter: blur(1.12px);
  animation: 37s floatReverse2 infinite;
}
.particle:nth-child(57) {
  top: 5.8041112455%;
  left: 57.4488802337%;
  font-size: 27px;
  filter: blur(1.14px);
  animation: 38s float2 infinite;
}
.particle:nth-child(58) {
  top: 64.2335766423%;
  left: 68.4931506849%;
  font-size: 22px;
  filter: blur(1.16px);
  animation: 40s float2 infinite;
}
.particle:nth-child(59) {
  top: 52.6829268293%;
  left: 66.6666666667%;
  font-size: 20px;
  filter: blur(1.18px);
  animation: 25s floatReverse infinite;
}
.particle:nth-child(60) {
  top: 14.7783251232%;
  left: 87.9446640316%;
  font-size: 12px;
  filter: blur(1.2px);
  animation: 37s floatReverse2 infinite;
}
.particle:nth-child(61) {
  top: 55.9509202454%;
  left: 56.157635468%;
  font-size: 15px;
  filter: blur(1.22px);
  animation: 26s floatReverse infinite;
}
.particle:nth-child(62) {
  top: 57.3511543135%;
  left: 86.0215053763%;
  font-size: 23px;
  filter: blur(1.24px);
  animation: 21s floatReverse infinite;
}
.particle:nth-child(63) {
  top: 16.4848484848%;
  left: 84.8780487805%;
  font-size: 25px;
  filter: blur(1.26px);
  animation: 36s float2 infinite;
}
.particle:nth-child(64) {
  top: 67.4816625917%;
  left: 81.5324165029%;
  font-size: 18px;
  filter: blur(1.28px);
  animation: 29s floatReverse2 infinite;
}
.particle:nth-child(65) {
  top: 52.0481927711%;
  left: 13.5922330097%;
  font-size: 30px;
  filter: blur(1.3px);
  animation: 25s float2 infinite;
}
.particle:nth-child(66) {
  top: 91.8984280532%;
  left: 4.8685491723%;
  font-size: 27px;
  filter: blur(1.32px);
  animation: 37s float2 infinite;
}
.particle:nth-child(67) {
  top: 47.8632478632%;
  left: 35.3287536801%;
  font-size: 19px;
  filter: blur(1.34px);
  animation: 32s floatReverse infinite;
}
.particle:nth-child(68) {
  top: 10.6925880923%;
  left: 64.5161290323%;
  font-size: 23px;
  filter: blur(1.36px);
  animation: 39s float2 infinite;
}
.particle:nth-child(69) {
  top: 33.0900243309%;
  left: 8.8062622309%;
  font-size: 22px;
  filter: blur(1.38px);
  animation: 33s floatReverse infinite;
}
.particle:nth-child(70) {
  top: 83.8471023428%;
  left: 66.2710187933%;
  font-size: 11px;
  filter: blur(1.4px);
  animation: 23s floatReverse2 infinite;
}
.particle:nth-child(71) {
  top: 45.4655380895%;
  left: 76.9230769231%;
  font-size: 27px;
  filter: blur(1.42px);
  animation: 21s floatReverse infinite;
}
.particle:nth-child(72) {
  top: 67.8966789668%;
  left: 87.8578479763%;
  font-size: 13px;
  filter: blur(1.44px);
  animation: 38s floatReverse2 infinite;
}
.particle:nth-child(73) {
  top: 91.064871481%;
  left: 55.063913471%;
  font-size: 17px;
  filter: blur(1.46px);
  animation: 32s float2 infinite;
}
.particle:nth-child(74) {
  top: 85.1897184823%;
  left: 5.8997050147%;
  font-size: 17px;
  filter: blur(1.48px);
  animation: 35s float infinite;
}
.particle:nth-child(75) {
  top: 60.1212121212%;
  left: 3.9024390244%;
  font-size: 25px;
  filter: blur(1.5px);
  animation: 25s floatReverse infinite;
}
.particle:nth-child(76) {
  top: 65.8595641646%;
  left: 14.6198830409%;
  font-size: 26px;
  filter: blur(1.52px);
  animation: 22s float2 infinite;
}
.particle:nth-child(77) {
  top: 72.2891566265%;
  left: 56.3106796117%;
  font-size: 30px;
  filter: blur(1.54px);
  animation: 34s float infinite;
}
.particle:nth-child(78) {
  top: 50.2415458937%;
  left: 71.9844357977%;
  font-size: 28px;
  filter: blur(1.56px);
  animation: 29s floatReverse infinite;
}
.particle:nth-child(79) {
  top: 77.4818401937%;
  left: 25.3411306043%;
  font-size: 26px;
  filter: blur(1.58px);
  animation: 21s floatReverse2 infinite;
}
.particle:nth-child(80) {
  top: 0.9708737864%;
  left: 69.3359375%;
  font-size: 24px;
  filter: blur(1.6px);
  animation: 32s float infinite;
}

@keyframes apparition {
  from {
    opacity: 0;
    transform: translateY(100px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes float {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(180px);
  }
}
@keyframes floatReverse {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-180px);
  }
}
@keyframes float2 {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(28px);
  }
}
@keyframes floatReverse2 {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-28px);
  }
}