Código de tablet de desenho HTML com Javascript

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<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Andev Web</title>
     <script src="https://cdn.jsdelivr.net/gh/hicodersofficial/drawing-tablet@main/lib/DrawingTablet.min.js"></script><link rel="stylesheet" href="./style.css">

</head>
<body>

</script>
</body>
  <script  src="./script.js"></script>

</body>
</html>

CSS

* {
    margin: 0;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
#canvas-container {
    width: 100%;
    height: 100vh;
}

.dt-control-container {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-top-right-radius: 8px;
    border-top-left-radius: 8px;
    border: 1px solid #404040;
    border-bottom: 1px solid transparent;
    background: #222222;
    display: flex;
    align-items: center;
    padding: 12px;
}
.dt-dc-container {
    border-left: 1px solid #404040;
    border-right: 1px solid #404040;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.4rem;
}
.dt-default-colors {
    position: relative;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    border: solid 2px transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.dt-default-colors div {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    box-sizing: border-box;
    box-shadow: none;
}
.dt-cp-container {
    width: 28px;
    height: 28px;
    border: solid 2px transparent;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.4rem;
}
.dt-color-picker {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: radial-gradient(
            50% 50% at 50% 50%,
            #ffffff 0%,
            transparent 100%
        ),
        conic-gradient(
            from 0deg at 50% 50%,
            #ff0000 0deg,
            #ffa800 47.73deg,
            #ffff00 79.56deg,
            #00ff00 121.33deg,
            #00ffff 180.99deg,
            #0000ff 238.67deg,
            #ff00ff 294.36deg,
            #ff0000 360deg
        ),
        #c4c4c4;
    transform: rotate(105deg);
}

.hide {
    display: none;
}

.dt-tools-container {
    position: relative;
    width: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.dt-tools-container img {
    position: absolute;
    max-height: 70px;
    bottom: -25px;
    transition: all 0.2s;
    cursor: pointer;
}

.dt-tools-container img:hover {
    bottom: -10px;
    opacity: 0.8;
    transform: scale(1.1);
}
#size {
    width: 35px;
    height: 30px;
    margin: 0 0.8rem;
    border: none;
    border-radius: 4px;
    background: #3d3d3d;
    color: #fff;
    font-size: 18px;
    font-weight: 500;
    -moz-appearance: textfield;
}
#size::-webkit-outer-spin-button,
#size::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.dt-undo-redo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    border-left: 1px solid #404040;
    padding: 0 0.8rem;
}

.dt-undo-redo-container img {
    width: 18px;
    cursor: pointer;
}
.dt-download-container {
    border-left: 1px solid #404040;
    padding: 0 0.8rem;
}
.dt-download-container img {
    width: 18px;
    cursor: pointer;
}
#redo {
    margin-left: 0.8rem;
}

JS

let opts = {
    brushColor: "#ffffff",
    brushSize: parseInt(size.value)
};

const dt = new DrawingTablet("#canvas-container", {
    logs: true,
    fullscreen: true,
    brushSize: opts.brushSize,
    bg: "#181818",
    color: opts.brushColor,
    autosave: true
});

dt.log("Drawing Tablet Initialized");

const dcs = document.querySelectorAll(".dt-default-colors");
const dcp = document.querySelectorAll(".dt-cp-container");

dcs.forEach((e) => {
    e.children[0].style.background = e.dataset.color;
    selectColor();
    e.addEventListener("click", () => {
        dt.brushColor = e.dataset.color;
        opts.brushColor = e.dataset.color;
        selectColor();
    });
});
function selectColor() {
    dcs.forEach((el) => {
        el.style.border = `2px solid  ${
            opts.brushColor === el.dataset.color
                ? el.dataset.color
                : "transparent"
        }`;
    });
}
dtPicker.addEventListener("input", (e) => {
    dt.brushColor = e.target.value;
    selectColor();
});
download.addEventListener("click", () => {
    dt.download();
});
undo.addEventListener("click", () => {
    dt.undo();
});
redo.addEventListener("click", () => {
    dt.redo();
});
clear.addEventListener("click", () => {
    const b = confirm("Are you sure to clear?");
    if (b) {
        dt.clear();
    }
});

size.addEventListener("input", (e) => {
    dt.brushSize = parseInt(e.target.value);
});

pencil.addEventListener("click", () => {
    dt.pencil();
    dt.brushSize = parseInt(size.value);
    dt.brushColor = opts.brushColor;
    isSelected();
});

highlighter.addEventListener("click", () => {
    dt.highlighter();
    dt.brushColor = opts.brushColor;
    isSelected();
});

eraser.addEventListener("click", () => {
    dt.eraser();
    isSelected();
});

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