style.css

*,*::after,*::before{
    box-sizing: border-box;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', sans-serif; 
}

body{
    background: linear-gradient(to right,hsl(200,100%,50%),hsl(175,100%,50%));
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}

.clock{
    width: 300px;
    height: 300px;
    background-color: rgba(255,255,255, .8);
    border-radius: 50%;
    border: 2px solid black;
    position: relative;
}

.clock .number {
    --rotation: 0;
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    font-size: 1.5rem;
    transform: rotate(var(--rotation));
}

.clock .number1 {--rotation: 30deg;}
.clock .number2 {--rotation: 60deg;}
.clock .number3 {--rotation: 90deg;}
.clock .number4 {--rotation: 120deg;}
.clock .number5 {--rotation: 150deg;}
.clock .number6 {--rotation: 180deg;}
.clock .number7 {--rotation: 210deg;}
.clock .number8 {--rotation: 240deg;}
.clock .number9 {--rotation: 270deg;}
.clock .number10 {--rotation: 300deg;}
.clock .number11 {--rotation: 330deg;}

.clock .hand{
    --rotation:0;
    position: absolute;
    bottom: 50%;
    left: 50%;
    border: 1px solid white;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    transform-origin: bottom;
    z-index: 10;
    transform: translateX(-50%) rotate(calc(var(--rotation) * 1deg));
}

.clock::after{
    content: '';
    position:absolute;
    background-color: black;
    z-index: 11;
    width: 15px;
    height: 15px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    border-radius: 50%;
}

.clock .hand.second{
    width: 3px;
    height: 45%;
    background-color: red;
}

.clock .hand.minute{
    width: 7px;
    height: 40%;
    background-color: black;
}

.clock .hand.hour{
    width: 10px;
    height: 35%;
    background-color: black;
}