2進数時計
body { font-family: 'Arial', sans-serif; background-color: #121212; color: #ffffff; text-align: center; margin: 0; padding: 20px; } h1 { font-size: 2rem; margin-bottom: 20px; } .clock { display: flex; justify-content: center; gap: 20px; } .column { display: flex; flex-direction: column-reverse; /* …
