glitch-countdown/dist/main.css

body {
    background-color: black;
}

#countdown {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50vw;
    height: 8vw;
    background-color: grey;
}

#countdown .part {
    display: inline-block;
    position: relative;
    padding-top: 1vw;
}

#countdown * {
    font-size: 3vw;
}

#countdown input {
    width: 6vw;
    height: 3.3vw;
}

#countdown .up, #countdown .down {
    position: absolute;
    line-height: 3vw;
    width: 1vw;
    text-align: center;
    left: calc(50% - 0.5vw);
    transform: rotate(90deg);
    cursor: pointer;
}

#countdown .up {
    top: calc(-1vw - 0.2vw);
}

#countdown .down {
    top: calc(3.3vw + 0.2vw);
}

#countdown.counting .up, #countdown.counting .down {
    display: none;
}