body{font-family:Arial;margin:0;color:#222}header{padding:20px;background:#111;color:white;display:flex;justify-content:space-between}a{margin:10px}.hero{padding:100px;background:#222;color:white}.btn{background:#d00;color:white;padding:12px 25px}.wa{position:fixed;right:20px;bottom:20px;background:green;color:white;padding:15px}