Add this to head:

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">

You can disable default touch actions on buttons like this:

https://stackoverflow.com/questions/10614481/disable-double-...

I think making the controls into actual button elements would fix this. (Suspecting they are divs with onclick handlers now.)

tested, meta is not enough

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum scale=1.0, user-scalable=0">

    <style> 
    body {
      touch-action: none;
    }
    <style>