body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f4f4f4; }
header { background: #222; color: #fff; padding: 20px; text-align: center; }
.clock-box { background: #fff; padding: 20px; margin: 20px; border-radius: 8px; text-align: center; }
.clock { font-size: 28px; font-weight: bold; margin-top: 10px; }
section { background: #fff; margin: 20px; padding: 20px; border-radius: 8px; }