.stage {
        box-sizing: border-box;
        position: absolute;
        left: 0;
        top: 0;
        width: 100vw;
        height: 100vh;
        overflow: hidden;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: #65799b;
      }
      
      .btn {
        width: 200px;
        font-size: 20px;
        height: 60px;
        border: none;
        outline: none;
        background: #c38b8b;
        color: #fff;
        cursor: pointer;
        position: relative;
        z-index: 0;
        border-radius: 10px;
      }
      
      .btn::before {
        position: absolute;
        content: "";
        width: calc(100% + 4px);
        height: calc(100% + 4px);
        left: -2px;
        top: -2px;
        background: linear-gradient(
          124deg,
          #ff2400,
          #e81d1d,
          #e8b71d,
          #e3e81d,
          #1de840,
          #1ddde8,
          #2b1de8,
          #dd00f3,
          #dd00f3
        );
        background-size: 400%;
        z-index: -1;
        filter: blur(5px);
        animation: move 20s linear infinite;
        opacity: 0;
        transition: opacity 0.3s ease-in-out;
        border-radius: 10px;
      }
      
      .btn:hover::before {
        opacity: 1;
      }
      
      .btn::after {
        z-index: -1;
        content: "";
        position: absolute;
        width: 100%;
        height: 100%;
        background: #555273;
        left: 0;
        top: 0;
        border-radius: 10px;
      }
      
      @keyframes move {
        0% {
          background-position: 0 0;
        }
        50% {
          background-position: 400% 0;
        }
        100% {
          background-position: 0 0;
        }
      }

      Css language logo
      Rainbow Dynamic Shadow

      Rainbow
      Shadow
      Custom Buttons in CSS

      HTML =

      <div class="stage"> <button class="btn">Hover me</button> </div>

      Shortcut: btn.shadow1

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