html, body {
    width: 100%;
    height:100%;
  }
  
  body {
    font-family: Verdana, Helvetica, sans-serif;
      background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
      background-size: 400% 400%;
      animation: gradient 15s ease infinite;
  }
  
  @keyframes gradient {
      0% {
          background-position: 0% 50%;
      }
      50% {
          background-position: 100% 50%;
      }
      100% {
          background-position: 0% 50%;
      }
  }