body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: radial-gradient(circle at top, #111 0%, #000 60%);
    font-family: 'Segoe UI', Arial, sans-serif;
}

#clock {
    font-size: 90px;
    font-weight: 600;
    color: #00ffcc;
    letter-spacing: 4px;
    padding: 30px 50px;
    border-radius: 16px;
    background: rgba(0, 0, 0, 0.6);
    box-shadow:
        0 0 15px rgba(0, 255, 204, 0.4),
        inset 0 0 10px rgba(0, 255, 204, 0.2);
}