body { font-family: Arial, sans-serif; font-size: 14px; margin: 0; padding: 0; }
header { background:#222; color:#fff; padding:10px 20px; }
header a { color: #fff; text-decoration:none; }
main { padding: 20px; }
.error { color: red; }
table { border-collapse: collapse; width: 100%; font-size: 12px}
table, th, td { border: 1px solid #ccc; padding: 8px; }