body{font-family:Arial,sans-serif;margin:0;background:#111;color:#eee}header{padding:20px;text-align:center}nav a{color:#8df;margin:0 10px;text-decoration:none}.hero{padding:80px 20px;text-align:center}.btn{background:#2ecc71;color:#fff;padding:12px 22px;text-decoration:none;border-radius:6px}section{max-width:900px;margin:auto;padding:50px 20px}input,textarea{display:block;width:100%;margin:10px 0;padding:10px}button{padding:10px 20px}