body{font-family:Arial,sans-serif;margin:0}header{background:#1b5e20;padding:15px}nav a{color:#fff;margin:0 10px;text-decoration:none}.hero{padding:80px;text-align:center;background:#e8f5e9}.container{padding:40px}.wa{position:fixed;right:20px;bottom:20px;background:#25D366;color:#fff;padding:12px 16px;border-radius:30px;text-decoration:none}footer{background:#1b5e20;color:#fff;padding:20px;text-align:center;margin-top:40px}