html {
    background: dodgerblue;
    background-size: cover;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    font-size: 10px;
}
body {
    margin: 0;
    font-size: 2rem;
    min-height: 100vh;
    display: flex;
    flex: 1;
    align-content: center;
}
.clock {
    width: 30rem;
    height: 30rem;
    border: 20px solid black;
    border-radius: 50%;
    margin: 100px auto;
    position: relative;
    padding: 2rem;
    box-shadow:
        0 0 0 4px rgba(0,0,0,0.1),
        inset 0 0 0 3px #efefef,
        inset 0 0 10px black,
        0 0 10px rgba(0,0,0,0.2);

}
.clock-face {
    position: relative;
    width: 100%;
    height: 100%;
    transform: translateY(-3px);
}
.hand {
    width: 50%;
    height: 6px;
    background: black;
    position: absolute;
    top: 50%;
    transform-origin: 100%;
    transform: rotate(90deg);
    transition: all 0.05s;
    transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
}