body {
    background-image: url('block.gif');
    background-repeat: no-repeat;
    background-size: cover;
}

h1 {
    color: white;
    text-align: center;
    margin-top: 350px;
  }
  
  h1:hover {
    animation: disco 0.5s infinite, spin 3s infinite linear;
  }
  
  @keyframes spin {
    from {
      transform: rotate(0deg) scale(1);
    }
    to {
      transform: rotate(360deg) scale(3);
    }
  }
  
  @keyframes disco {
    0% {
      color: red;
    }
    25% {
      color: blue;
    }
    50% {
      color: green;
    }
    75% {
      color: yellow;
    }
    100% {
      color: red;
    }
  }