Botão animado em CSS com efeito de ondulação

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Button</title>
  <style>
    *{margin:0;padding:0;box-sizing:border-box}
    body{height:100vh;display:flex;justify-content:center;align-items:center;background:#0a0a0a;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}
    .btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:16px 36px;font-size:1.1rem;font-weight:600;color:#fff;background:transparent;border:2px solid #333;border-radius:16px;cursor:pointer;overflow:hidden;transition:all .4s cubic-bezier(.2,.8,.2,1)}
    .btn svg{width:20px;height:20px;transition:transform .4s ease}
    .btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,#333,transparent);transition:all .6s ease}
    .btn:hover{transform:translateY(-4px);border-color:#fff;box-shadow:0 20px 40px rgba(0,0,0,.3)}
    .btn:hover::before{left:100%}
    .btn:hover svg{transform:translateX(6px)}
    .btn:active{transform:translateY(-1px)}
    .wave{position:absolute;border-radius:50%;background:rgba(255,255,255,.15);transform:scale(0);animation:wave .7s ease-out forwards;pointer-events:none}
    @keyframes wave{to{transform:scale(3.5);opacity:0}}
  </style>
</head>
<body>
  <button class="btn" id="btn">
    CLICK ME
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <path d="M5 12h14M12 5l7 7-7 7"/>
    </svg>
  </button>
  <script>
    const btn=document.getElementById('btn');
    btn.addEventListener('click',e=>{
      const rect=btn.getBoundingClientRect();
      const size=Math.max(rect.width,rect.height)*1.2;
      const x=e.clientX-rect.left-size/2;
      const y=e.clientY-rect.top-size/2;
      const wave=document.createElement('span');
      wave.classList.add('wave');
      wave.style.width=wave.style.height=size+'px';
      wave.style.left=x+'px';
      wave.style.top=y+'px';
      btn.appendChild(wave);
      setTimeout(()=>wave.remove(),700);
    });
  </script>
</body>
</html>

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