body{font-family:Arial,sans-serif;margin:0;background:#eef}
header,footer{background:#0b5ed7;color:#fff;padding:20px;text-align:center}
nav{padding:10px;background:#222}nav a{color:#fff;margin-right:12px}
section{background:#fff;margin:20px;padding:20px;border-radius:8px}
table{border-collapse:collapse;width:100%}th,td{padding:8px}
.dark{background:#222;color:#eee}.dark section{background:#333}