index.html

<!DOCTYPE html>

<html>

<head>

</head>

<body>

    <div class="row">
        <div class="left">
            <div id="sliders"></div>
        </div>
        <div class="right">
            <img src="image.png" id="template" style="display:none;">
            <canvas id="image" width="800" height="2100" style="float:right;"></canvas>
        </div>
    </div>

</body>

<script>
    const state = new Array(20).fill(6)
    const sliders = document.getElementById("sliders")
    for (let i = 0; i < 20; i++) {
        const slider = document.createElement("p")
        slider.innerHTML = '<input type="range" min="1" max="10" value="6" class="slider" id=`slider${i}`></div>'
        sliders.appendChild(slider)
        const sl = slider.children[0]
        sl.oninput = function () {
            state[i] = sl.value
            load()
        }
    }
    function load() {
        var ctx = document.getElementById("image").getContext("2d")
        var template = document.getElementById("template")
        ctx.drawImage(template, 0, 0, 800, 2100)
        ctx.fillStyle = "#ffffff80"
        for (let i = 0; i < 20; i++) {
            ctx.fillRect(80 * state[i] - 80, 105 * i, 80, 105)
        }
    }
    window.onload = () => load()

</script>

<style>
    body {
        size: 100%;
        margin: 0%;
        padding: 2%;
        background-color: #000000ff;
    }

    p {
        font-family: font;
        font-size: 24px;
        text-align: center;
    }

    .row {
        display: flex;
    }

    .column {
        float: left;
    }

    .left {
        width: 10%;
    }

    .right {
        width: 90%;
    }

    .slider {
        -webkit-appearance: none;
        width: 100%;
        height: 16px;
        border-radius: 8px;
        background: #404040ff;
        outline: none;
        margin-top: 28px;
        margin-bottom: 28px;
    }

    .slider::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: #00c0ffff;
        cursor: pointer;
    }

    .slider::-moz-range-thumb {
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: #00c0ffff;
        cursor: pointer;
    }
</style>

</html>