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javascript - how to a div draggeble and check the color behind it

I am trying to make a color picker.

function changeCurrentColor() {
    let mousey = event.clientY;
    document.getElementById("current-color").style.top = mousey;
}
div.main-colors {
    width: 10px;
    height: 200px;
    background-image: linear-gradient(red, orange, yellow, green, blue, purple);
}

div.current-color {
    height: 20px;
    width: 20px;
    border: black 1px solid;
    margin-left: -5px;
    border-radius: 50%;
    position: absolute;
    top: 95px;
    background-color: black;
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>color picker</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div class="main-colors">
            <div class="current-color" id="current-color" draggable="true" ondrag="changeCurrentColor()"></div>
        </div>
    </div>

    <script src="app.js"></script>
</body>
</html>
question from:https://stackoverflow.com/questions/65951058/how-to-a-div-draggeble-and-check-the-color-behind-it

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