body { font-family: sans-serif; margin: 0; padding: 0; }
header { background: #333; color: #fff; padding: 10px; }
nav { background: #eee; padding: 10px; }
nav a { margin-right: 10px; text-decoration: none; color: #333; }
.container { padding: 20px; }
table { border-collapse: collapse; width: 100%; }
table, th, td { border: 1px solid #ccc; padding: 8px; }
input, button { padding: 5px; margin: 2px; }