body{font-family:tahoma,Arial,sans-serif;max-width:1100px;margin:auto;padding:20px;line-height:1.8}
nav a{margin:0 8px;text-decoration:none}
header{padding:20px 0;border-bottom:1px solid #ddd}
footer{margin-top:40px;padding-top:10px;border-top:1px solid #ddd}
.btn{background:#0a7;padding:10px 16px;color:white;text-decoration:none;border-radius:6px}