body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: black;
    font-family: 'Courier New', monospace;
    margin: 0;
}

.clock {
    color: lime;
    font-size: 4rem;
    padding: 20px 40px;
    border: 3px solid lime;
    border-radius: 10px;
    box-shadow: 0 0 20px lime;
}