CSS Animation – Tick Tock

HTML

    <div class="window cut">
        <div class="container">
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
        </div>
    </div>
    <div class="window cut-black">
        <div class="container">
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
            <div class="tick"><div class="letter">I</div></div>
            <div class="tick"><div class="letter">O</div></div>
        </div>
    </div>
    <div class="outside-letter t">T</div>
    <div class="outside-letter c">C</div>
    <div class="outside-letter k">K</div>

CSS

    body {
        align-items: center;
        display: flex;
        font-family: sans-serif;
        font-weight: 600;
        font-size: 4.5vh;
        height: 100vh;
        justify-content: center;
        margin: 0;
        overflow: hidden;
        background:#262626
    }

    .window {
        color:red;
        height: 8vh;
        left: calc(50% - 4vh);
        position: absolute;
        top: calc(50% - 19.5vh);
        width: 8vh;
    }

    .cut-black {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
        color: #fff;
    }

    .container {
        animation: 2s Turn infinite linear;
        height: 32vh;
        margin-left: -12vh;
        margin-top: 19.5vh;
        transform-origin: 50% 0%;
        width: 32vh;
    }

    .tick {
        align-items: center;
        display: flex;
        height: 0;
        justify-content: flex-start;
        position: absolute;
        transform-origin: 100% 50%;
        transform: rotate(var(--angle));
        width: 16vh;
    }

        .tick:nth-child(1) {
            --angle: 0deg;
        }

        .tick:nth-child(2) {
            --angle: 30deg;
        }

        .tick:nth-child(3) {
            --angle: 60deg;
        }

        .tick:nth-child(4) {
            --angle: 90deg;
        }

        .tick:nth-child(5) {
            --angle: 120deg;
        }

        .tick:nth-child(6) {
            --angle: 150deg;
        }

        .tick:nth-child(7) {
            --angle: 180deg;
        }

        .tick:nth-child(8) {
            --angle: 210deg;
        }

        .tick:nth-child(9) {
            --angle: 240deg;
        }

        .tick:nth-child(10) {
            --angle: 270deg;
        }

        .tick:nth-child(11) {
            --angle: 300deg;
        }

        .tick:nth-child(12) {
            --angle: 330deg;
        }

    .letter {
        align-items: center;
        display: flex;
        height: 0;
        justify-content: center;
        transform: rotate(90deg);
        width: 0;


    }

    .outside-letter {
        position: absolute;
        -moz-transform: translateY(1.5vh);
        color: #fff;
    }

    .t {
        top: 25vh;
    }

    .c {
        top: 37vh;
    }

    .k {
        top: 43vh;
    }

    @keyframes Turn {
        0% {
            transform: rotate(0deg);
        }

        22% {
            transform: rotate(30deg);
        }

        49% {
            transform: rotate(30deg);
        }

        69% {
            transform: rotate(60deg);
        }

        100% {
            transform: rotate(60deg);
        }
    }