body{margin:0;background:#222;display:flex;justify-content:center;align-items:center;min-height:100vh;font-family:Arial}.card{background:#fff;padding:16px;border-radius:16px;max-width:420px}.card img{width:100%}.btn{display:block;margin:12px 0;padding:14px;text-align:center;text-decoration:none;color:#fff;background:#d00;border-radius:10px}.wa{background:#25D366}