playwright/test/assets/grid.html

<script>
document.addEventListener('DOMContentLoaded', function() {
    function generatePalette(amount) {
        var result = [];
        var hueStep = 360 / amount;
        for (var i = 0; i < amount; ++i)
            result.push('hsl(' + (hueStep * i) + ', 100%, 90%)');
        return result;
    }

    var palette = generatePalette(100);
    for (var i = 0; i < 200; ++i) {
        var box = document.createElement('div');
        box.classList.add('box');
        box.style.setProperty('background-color', palette[i % palette.length]);
        var x = i;
        do {
            var digit = x % 10;
            x = (x / 10)|0;
            var img = document.createElement('img');
            img.src = `./digits/${digit}.png`;
            box.insertBefore(img, box.firstChild);
        } while (x);
        document.body.appendChild(box);
    }
});
</script>

<style>

body {
    margin: 0;
    padding: 0;
}

.box {
    font-family: arial;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
    width: 50px;
    height: 50px;
    box-sizing: border-box;
    border: 1px solid darkgray;
}

::-webkit-scrollbar {
    display: none;
}

@keyframes move {
    from { left: -500px; background-color: cyan; }
    to { left: 0; background-color: rgb(255, 210, 204); }
}
.box.animation {
    position: relative;
    animation: 2s linear 0s move forwards;
}

</style>