js-clock/main.css

body {
    background-color: #e5e5e5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.clock {
    width: 300px;
    height: 300px;
    background-color: #adadad;
    border-radius: 50%;
    border: 2px solid #000000;
    position: relative;
}

.clock .hands {
    --rotation: 0;
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform-origin: bottom;
    transform: translateX(-50%) rotate(calc(var(--rotation) * 1deg));
}

.clock .hands.hrs {
    width: 6px;
    height: 25%;
    background-color: #000000;
}

.clock .hands.min {
    width: 4px;
    height: 37%;
    background-color: #000000;
}

.clock .hands.sek {
    width: 2px;
    height: 42%;
    background-color: #ff0000;
    border-top-left-radius: 40%;
    border-top-right-radius: 40%;
}

.clock .dot {
    position: absolute;
    background-color: #000000;
    width: 10px;
    height: 10px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 2px solid #ff0000;
    z-index: 10;
}

.clock .nums {
    --rotation: 0;
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    transform: rotate(var(--rotation));
    font-size: medium;
}

.clock .n01 {
    --rotation: 30deg;
}

.clock .n02 {
    --rotation: 60deg;
}

.clock .n03 {
    --rotation: 90deg;
}

.clock .n04 {
    --rotation: 120deg;
}

.clock .n05 {
    --rotation: 150deg;
}

.clock .n06 {
    --rotation: 180deg;
}

.clock .n07 {
    --rotation: 210deg;
}

.clock .n08 {
    --rotation: 240deg;
}

.clock .n09 {
    --rotation: 270deg;
}

.clock .n10 {
    --rotation: 300deg;
}

.clock .n11 {
    --rotation: 330deg;
}

.clock .n12 {
    --rotation: 360deg;
}