WhatsApp chat button for your website

<!-- WhatsApp chat button -->
<a href="https://wa.me/919876543210?text=Hi!%20I%20have%20a%20question." target="_blank" rel="noopener"
  style="position:fixed;bottom:20px;right:20px;z-index:9999;display:flex;align-items:center;gap:8px;
  background:#16a34a;color:#fff;padding:12px 18px;border-radius:999px;font:600 14px/1 system-ui,sans-serif;
  text-decoration:none;box-shadow:0 8px 24px rgba(0,0,0,.18)">
  <svg width="20" height="20" viewBox="0 0 24 24" fill="#fff" aria-hidden="true"><path d="M20.5 3.5A11.8 11.8 0 0 0 1.9 17.7L.5 23.5l5.9-1.5A11.8 11.8 0 0 0 20.5 3.5zM12 21.6c-1.8 0-3.6-.5-5.1-1.4l-.4-.2-3.5.9.9-3.4-.2-.4A9.6 9.6 0 1 1 12 21.6zm5.3-7.2c-.3-.1-1.7-.8-2-.9s-.5-.1-.7.1-.8.9-.9 1.1-.3.2-.6.1a7.9 7.9 0 0 1-3.9-3.4c-.3-.5.3-.5.8-1.6.1-.2 0-.4 0-.5l-.9-2.2c-.2-.6-.5-.5-.7-.5h-.6c-.2 0-.5.1-.8.4s-1 1-1 2.4 1 2.8 1.2 3c.1.2 2 3.1 4.9 4.3 1.8.8 2.5.8 3.4.7.6-.1 1.7-.7 2-1.4s.2-1.2.2-1.4c-.1-.1-.3-.2-.6-.3z"/></svg>
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</a>