Style

<style>
      html {
        box-sizing: border-box;
      }

      *,
      *::before,
      *::after {
        box-sizing: inherit;
      }

      html,
      body {
        height: 100%;
        min-width: 100%;
      }

      body {
        display: flex;
        justify-content: center;
        align-items: center;
        position: relative;
        margin: 0;
        font-family: 'Raleway', sans-serif;
        background: linear-gradient(57deg, #4f0f57, #000000);
        background-size: 400% 400%;

        -webkit-animation: r-animation 21s ease infinite;
        -moz-animation: r-animation 21s ease infinite;
        -o-animation: r-animation 21s ease infinite;
        animation: r-animation 21s ease infinite;
      }

      .content {
        width: 800px;
        padding-top: 20px;
        padding-bottom: 20px;
        color: #fff;
        text-align: center;
      }

      .logo {
        width: 128px;
        margin-bottom: 24px;
      }

      .heading {
        margin: 0;
        margin-bottom: 12px;
      }

      .links {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        position: absolute;
        bottom: 5%;
        left: 50%;
        width: 300px;
        margin: 0 auto;
        padding: 0;
        list-style-type: none;
        transform: translateX(-50%);
      }

      a {
        color: #fff;
      }

      @-webkit-keyframes r-animation {
        0% {
          background-position: 0% 50%;
        }
        50% {
          background-position: 100% 51%;
        }
        100% {
          background-position: 0% 50%;
        }
      }
      @-moz-keyframes r-animation {
        0% {
          background-position: 0% 50%;
        }
        50% {
          background-position: 100% 51%;
        }
        100% {
          background-position: 0% 50%;
        }
      }
      @-o-keyframes r-animation {
        0% {
          background-position: 0% 50%;
        }
        50% {
          background-position: 100% 51%;
        }
        100% {
          background-position: 0% 50%;
        }
      }
      @keyframes r-animation {
        0% {
          background-position: 0% 50%;
        }
        50% {
          background-position: 100% 51%;
        }
        100% {
          background-position: 0% 50%;
        }
      }
    </style>