body{font-family:Arial;background:#f9f9f9;margin:0;}
header{background:#0b3c5d;color:#fff;padding:15px;text-align:center;}
nav a{color:#fff;text-decoration:none;margin:0 10px;}
.whatsapp{position:fixed;bottom:20px;right:20px;background:#25D366;color:#fff;padding:15px;border-radius:50%;font-size:20px;text-decoration:none;}
.hero{text-align:center;padding:60px;background:#1d7dc5;color:#fff;}
footer{text-align:center;background:#111;color:#fff;padding:10px;}