botón brillante 2

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HTML

CSS

* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background: black;
      width: 100vw;
      height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      font-family: 'Playfair Display', serif;
    }
    /* botão com box-shadow */
    .glowing-btn-2 {
      color: #f1f5f9;
      background: transparent;
      height: 10%;
      width: 15%;
      max-height: 200px;
      max-width: 300px;
      border-radius: 20px;
      border: solid 2px #8400ff;
      position: relative;
      overflow: hidden;
      cursor: pointer;
      font-size: 1.2rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 1px;
      box-shadow: 0 0 15px rgba(168, 85, 247, 0.4), 0 0 30px rgba(168, 85, 247, 0.2);
      transition: box-shadow 0.3s ease;
    }
    .glowing-btn-2:hover {
      box-shadow: 0 0 20px rgba(132, 0, 255, 0.6), 0 0 40px rgba(168, 85, 247, 0.3);
    }
    /* after com tamanho inicial de 0 e centralizado */
    .glowing-btn-2:active::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      border-radius: 20px;
      width: 0;
      height: 0;
      background: rgba(161, 60, 255, 0.15);
      transform: translate(-50%, -50%);
      animation: rippleEffect 2s ease-out forwards;
    }
    /*animacao para expandir o after começando de height 100% e indo para 200% */
    @keyframes rippleEffect {
      0% {
        width: 0;
        height: 100%;
        opacity: 1;
      }
      100% {
        width: 200%;
        height: 200%;
        opacity: 1;
      }
    }