body{margin:0;padding:1rem;background:#1b1a1a;color:#fff}input[type=datetime-local]{font-family:Arial,sans-serif;font-size:16px;background-color:#f0f0f0;border:1px solid #ccc;padding:5px}input[type=datetime-local]::-webkit-calendar-picker-indicator{background-color:#f0f0f0}input[type=datetime-local]::-moz-calendar-picker-indicator{background-color:#b81919}.is-invalid{border:1px solid red}nav ul{display:flex;gap:1rem;margin:0;padding:0;list-style-type:none}nav ul li{padding:.5rem}nav ul li a{color:#fff}