body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
    margin: 0;
}

.binary-clock {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.row {
    display: flex;
    margin: 5px;
}

.circle {
    width: 20px;
    height: 20px;
    margin: 5px;
    border-radius: 50%;
    background-color: #555;
}

.circle.on {
    background-color: #0f0;
}