<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Page 404 Neon</title>
    <style>
      @import url('https://fonts.googleapis.com/css2?family=Neonderthaw&display=swap');

      /*Neon font */
      @font-face {
        font-family: 'neon';
        /*src: url('Neoneon-3zaD6.otf') format('opentype');*/
      }

      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }

      body {
        height: 100vh;
        text-align: center;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        font-size: 16px;
        font-family: 'Neonderthaw', 'neon', cursive;
        background: #000;
        color: rgb(230, 230, 230);
        overflow: hidden;
        -webkit-animation: Random_Color 5s linear infinite;
        -o-animation: Random_Color 5s linear infinite;
        animation: Random_Color 5s linear infinite;
      }

      @keyframes Random_Color {

        0%,
        100% {
          filter: hue-rotate(0deg);
        }

        50% {
          filter: hue-rotate(360deg);
        }
      }

      .Text_404 {
        padding: 0;
        display: flex;
        margin: 1.725rem 0;
      }

      .Text_404 span {
        font-size: 6em;
        font-family: 'neon', 'Neonderthaw', cursive;
        padding: 0 1.725rem;
        animation: animate1 1s linear infinite;
      }

      .Text_404 span:nth-child(1) {
        animation-delay: 0s;
      }

      .Text_404 span:nth-child(2) {
        animation-delay: 0.25s;
      }

      .Text_404 span:nth-child(3) {
        animation-delay: 0.5s;
      }

      @keyframes animate1 {

        0%,
        100% {
          color: #fff;
          filter: blur(2px);
          text-shadow: 0 0 10px var(--color5),
            0 0 20px var(--color5),
            0 0 40px var(--color5),
            0 0 80px var(--color5),
            0 0 120px var(--color5),
            0 0 200px var(--color5),
            0 0 300px var(--color5),
            0 0 400px var(--color5);
        }

        5%,
        95% {
          color: #111;
          filter: blur(0);
          text-shadow: 0 0 10px transparent;
        }
      }

      .description {
        color: #fff;
        text-shadow: 0 0 10px var(--color2),
          0 0 20px var(--color2),
          0 0 40px var(--color2),
          0 0 80px var(--color2),
          0 0 120px var(--color2),
          0 0 200px var(--color2),
          0 0 300px var(--color2),
          0 0 400px var(--color2);
        font-size: 3em;
        margin: 1.725rem 0;
      }

      .btn {
        cursor: pointer;
        display: inline-block;
        font-weight: 400;
        text-align: center;
        white-space: nowrap;
        vertical-align: middle;
        padding: .375rem .75rem;
        margin: .375rem;
        font-size: 2.252em;
        color: var(--color3);
        transition: all .5s ease-in-out;
        text-decoration: none;
      }

      @media (max-width: 768px) {
        .Text_404 span {
          font-size: 3em;
        }

        .description {
          font-size: 1.5em;
        }

        .btn {
          font-size: 1.252em;
        }
      }

      :root {
        --color1: #e43636;
        --color2: #5ae8e8;
        --color3: #37d334;
        --color4: #de6ce1;
        --color5: #fce146;
        --color6: #FF1493;
      }
    </style>
  </head>
  <body>
    <h1 class="Text_404">
      <span>4</span>
      <span>X</span>
      <span>4</span>
    </h1>
    <p class="description">Oops! page not found</p>
    <a href="/" class="btn">Back to Home</a>
  </body>
</html>