body{font-family:Arial,sans-serif;margin:0;padding:0;line-height:1.6;} header{background:#003366;color:#fff;padding:20px;display:flex;justify-content:space-between;align-items:center;} nav a{color:#fff;margin:0 15px;text-decoration:none;font-weight:bold;} .hero{padding:100px 20px;text-align:center;background:#f4f4f4;} button{background:#ff9900;color:#fff;padding:15px 30px;border:none;cursor:pointer;font-size:18px;}