.rainbow:hover {
      letter-spacing: 0px;
      filter: none;
      animation-name: rainbow;
      animation-duration: 1.8s;
      animation-iteration-count: infinite;
      animation-timing-function: ease-in-out;
    }
    
    @keyframes rainbow {
      0% {
        color: #d593ff;
      }

      20% {
        color: #00c3fe;
      }

      40% {
        color: #8ef77b;
      }

      60% {
        color: #f9d56a;
      }

      80% {
        color: #fea17f;
      }

      100% {
        color: #ff76b1;
      }
    }