Fix issue on mobile where the control box is too far to the right when first opened.

[patudom]

On my phone, when I open the controls, the box is too far to the right and the text is not visible. If I tap on the controls box again in just the right way, the box will slide back onto the screen, but I'm not sure how to fix this so it appears correctly from the start.

When I first tap the control box, the text is of

f screen:

If I tap the box in just the right way, it does slide into the right position:

Originally posted by @patudom in #236 (comment)