Reference to below code, its working fine with Main Page while it gets stop working under sub page (i.e. Site1 > Webform1)
<!DOCTYPE html>
<html>
<head>
    <style>
        body
        {
            height: 7500px;
            width: 5000px;
        }
        
        button
        {
            position: fixed;
        }
    </style>
</head>
<body>
    <p>
        Click one of the buttons (multiple times) to scroll the document window.</p>
    <p>
        Look at each scrollbar to see the effect.</p>
    <button onclick="scrollWin(0, 50)">
        Scroll down</button><br>
    <br>
    <button onclick="scrollWin(0, -50)">
        Scroll up</button><br>
    <br>
    <button onclick="scrollWin(100, 0)">
        Scroll right</button><br>
    <br>
    <button onclick="scrollWin(-100, 0)">
        Scroll left</button><br>
    <br>
    <script>
        function scrollWin(x, y) {
            window.scrollBy(x, y);
        }
    </script>
</body>
</html>