html, body {
    height: 100%;
    overflow: hidden;
  }
  
  .error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
  }

  .error-page h1 {
    font-weight: 900;
    font-size: 20vh;
    font-weight: bold;
    letter-spacing: -5px;
    position: relative;
    margin: -8vh 0 -4vh;
    padding: 0;
  }

  .error-page h1:after {
    content: attr(data-h1);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    color: transparent;
    /* webkit only for graceful degradation to IE */
    --background: -webkit-repeating-linear-gradient(-45deg, #71b7e6, #69a6ce, #b98acc, #ee8176, #b98acc, #69a6ce, #9b59b6);
    background-color: #093696;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 400%;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.25);
    --animation: animateTextBackground 10s ease-in-out infinite;
  }

  .error-page h1 + p {
    position: relative;
    color: #d6d6d6;
    font-size: 4vh;
    font-weight: bold;
    max-width: 600px;
    margin: 0;
  }

  .error-page h1 + p:after {
    content: attr(data-p);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    color: transparent;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
  }
  
  #particles-js {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
  
  @keyframes animateTextBackground {
    0% {
      background-position: 0 0;
    }
    25% {
      background-position: 100% 0;
    }
    50% {
      background-position: 100% 100%;
    }
    75% {
      background-position: 0 100%;
    }
    100% {
      background-position: 0 0;
    }
  }
  @media (max-width: 767px) {
    .error-page h1 {
      font-size: 32vw;
    }
    .error-page h1 + p {
      font-size: 8vw;
      line-height: 10vw;
      max-width: 70vw;
    }
  }

  a.back {
    position: fixed;
    right: 40px;
    bottom: 40px;
    --background: -webkit-repeating-linear-gradient(-45deg, #71b7e6, #69a6ce, #b98acc, #ee8176);
    background-color: gray;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    line-height: 24px;
    padding: 15px 30px;
    text-decoration: none;
    transition: 0.25s all ease-in-out;
  }
  
  a.back:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  }