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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
  <link rel="stylesheet" href="style.css">
  <script  src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <title>Andev Web</title>
</head>
<body>
  <div class="container col-md-8">
    <div class="row">
      <div class="four0four col-md-4 col-sm-12 offset-md-2"><span class="off">4</span><span class="flicker2">0</span><span class="flicker3">4</span></div>
      <div class="not-found col-lg-2 col-md-12"><span class="flicker4">P</span><span class="off">a</span><span>ge </span><span>not </span><span class="off">f</span><span class="flicker1">o</span><span class="flicker3">u</span><span>n</span><span class="off">d</span></div>
      <div class="fog0"></div>
      <div class="fog1"></div>
      <div class="fog2"></div>
      <div class="fog3"></div>
      <div class="fog4"></div>
      <div class="fog5"></div>
      <div class="fog6"></div>
      <div class="fog7"></div>
      <div class="fog8"></div>
      <div class="fog9"></div>
    </div>
  </div>
</body>
</html>

CSS

@import url("https://fonts.googleapis.com/css?family=Comfortaa:300,400,700");
.not-found, .four0four {
  font-family: "Comfortaa";
}

* {
  box-sizing: border-box;
}

html {
  height: 100vh;
}

body {
  background: #121428;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100vh;
}

.container {
  align-items: center;
  margin: auto;
}

.row {
  margin-top: 30vh;
  height: 200px;
  min-width: 300px;
}

.four0four {
  color: white;
  text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  color: white;
  margin-top: -67px;
  font-size: 15em;
  text-align: right;
  min-width: 450px;
  z-index: 5;
}
.four0four:before {
  content: "404";
  position: absolute;
  color: #ff78fa;
  mix-blend-mode: color-dodge;
  z-index: 1;
}

.not-found {
  color: white;
  text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  line-height: 110%;
  font-size: 3.75em;
}
.not-found:before {
  letter-spacing: 0.25px;
  content: "Page not found";
  position: absolute;
  color: #ff78fa;
  mix-blend-mode: color-dodge;
  z-index: 1;
}

.flicker1 {
  animation: 5s linear 3.25s flickr infinite;
}

.flicker2 {
  animation: 5s linear 1.25s flickr infinite;
}

.flicker3 {
  animation: 5s ease 1s flickr infinite;
}

.flicker4 {
  animation: 5s ease 2s flickr infinite;
}

.off {
  color: rgba(50, 50, 50, 0.25);
  border: none;
  text-shadow: none;
}

@keyframes flickr {
  0% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  1% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  2% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  8% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  10% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  11% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  12% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  13% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  14% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  53% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  54% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  58% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  59% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  60% {
    color: rgba(50, 50, 50, 0.25);
    border: none;
    text-shadow: none;
  }
  61% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
  100% {
    color: white;
    text-shadow: 0 0 1px rgba(255, 120, 250, 0.2), 0 0 2px rgba(200, 150, 250, 0.9), 0 0 70px #c896fa;
  }
}
.fog8, .fog7, .fog6, .fog5, .fog4, .fog3, .fog2, .fog1 {
  position: absolute;
  border: none;
  border-radius: 100%;
  z-index: 400;
}

.fog1 {
  width: 100px;
  height: 100px;
  animation: 75s linear float infinite;
  box-shadow: inset 0 0 50px rgba(255, 255, 255, 0.8), 0 0 50px rgba(255, 255, 255, 0.5);
}

.fog2 {
  width: 50px;
  height: 50px;
  box-shadow: inset 0 0 25px rgba(255, 255, 255, 0.8), 0 0 25px rgba(255, 255, 255, 0.5);
  margin-top: -25%;
  animation: 25s linear float2 infinite;
}

.fog3 {
  width: 80px;
  height: 80px;
  box-shadow: inset 0 0 40px rgba(255, 255, 255, 0.8), 0 0 40px rgba(255, 255, 255, 0.5);
  margin-left: 25%;
  animation: 40s ease float2 infinite;
}

.fog4 {
  width: 40px;
  height: 40px;
  margin-left: 60%;
  margin-top: -45%;
  animation: 45s linear float infinite;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.5);
}

.fog5 {
  width: 60px;
  height: 60px;
  margin-left: 50%;
  margin-top: -30%;
  animation: 30s ease float2 infinite;
  box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.8), 0 0 30px rgba(255, 255, 255, 0.5);
}

.fog5 {
  width: 125px;
  height: 125px;
  margin-left: 50%;
  margin-top: 30%;
  animation: 70s ease-out float3 infinite;
  box-shadow: inset 0 0 40px rgba(255, 255, 255, 0.8), 0 0 60px rgba(255, 255, 255, 0.5);
}

.fog6 {
  width: 20px;
  height: 20px;
  margin-left: 50%;
  margin-top: -10%;
  animation: 20s linear float infinite;
  box-shadow: inset 0 0 2px rgba(255, 255, 255, 0.8), 0 0 2px rgba(255, 255, 255, 0.5);
}

.fog7 {
  width: 50px;
  height: 50px;
  margin-left: 0%;
  margin-top: 30%;
  animation: 40s ease-out float3 infinite;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.5);
}

.fog8 {
  width: 80px;
  height: 80px;
  margin-left: 60%;
  margin-top: -20%;
  animation: 40s ease-out float3 infinite;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.5);
}

@keyframes float {
  0% {
    top: 50%;
    left: 10%;
  }
  25% {
    top: 75%;
    left: 25%;
  }
  50% {
    top: 50%;
    left: 35%;
  }
  75% {
    top: 75%;
    left: 25%;
  }
  100% {
    top: 50%;
    left: 10%;
  }
}
@keyframes float2 {
  0% {
    top: 50%;
    left: 10%;
  }
  25% {
    top: 25%;
    left: 15%;
  }
  50% {
    top: 50%;
    left: 45%;
  }
  75% {
    top: 25%;
    left: 15%;
  }
  100% {
    top: 50%;
    left: 10%;
  }
}
@keyframes float3 {
  0% {
    top: 50%;
    left: 25%;
  }
  25% {
    top: 35%;
    left: 0;
  }
  50% {
    top: 10%;
    left: 10%;
  }
  75% {
    top: 35%;
    left: 0%;
  }
  100% {
    top: 50%;
    left: 25%;
  }
}
@media (max-width: 991px) {
  .container {
    margin-top: 30vh;
  }

.four0four {
    text-align: center;
    min-width: 100%;
    padding: 0;
    margin: 0;
    height: 200px;
    font-size: 10em;
  }

.not-found {
    font-size: 1.75em;
    padding: 0;
    margin: 0;
    text-align: center;
  }
}