index.html

<!DOCTYPE html>
<html lang="en">

    <head>
        <title>Scrollbar</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="lib_smooth-scrollbar.css">
        <link rel="stylesheet" href="style.css">
        <script src="lib_smooth-scrollbar.js"></script>
        <script src="lib_jquery.min.js"></script>
        <script src="lib_jquery.svg.js"></script>
        <script src="build.js"></script>
    </head>

    <body>
        <p class="size"> <span id="size">0</span> cm</p>
        <div id="scrollbar" class="scrollbar">
            <div id="content" class="content"></div>
        </div>
        <div class="cover left"></div>
        <div class="cover right"></div>
        <div id="mark" class="mark"></div>
    </body>

</html>