style.css

* {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
    font-size: 30px;
    font-family: 'Times New Roman';
}

body {
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: start;
    justify-content: center;
}

.clock {
    border: 25px dashed white;
    border-radius: 50%;
    height: 500px;
    width: 500px;
    margin-top: 10vh;
    background-color: yellow;
    background-position: center;
    background-size: cover;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.number {
    transform: rotate(calc(30deg * var(--n)));
    position: absolute;
    text-align: center;
    inset: 20px;
}

.number b {
    transform: rotate(calc(-30deg * var(--n)));
    display: inline-block;
}

.centre {
    border-radius: 50%;
    height: 25px;
    width: 25px;
    background-color: black;
    position: absolute;
    z-index: 1;
}

.second, .minute, .hour {
    --rotate: 0;
    position: absolute;
    left: 50%;
    bottom: 50%;
    transform: translate(-50%) rotate(calc(var(--rotate) * 1deg));
    transform-origin: bottom;
    border-radius: 50%;
}

.second {
    height: 225px;
    width: 5px;
    background-color: red;
}

.minute {
    height: 200px;
    width: 10px;
    background-color: blue;
}

.hour {
    height: 125px;
    width: 15px;
    background-color: green;
}