I like that that the font actually adjusts appropriately when using zoom-in/zoom-out, but it would be nice if the width of the playback div would also narrow to

I like that that the font actually adjusts appropriately when using zoom-in/zoom-out, but it would be nice if the width of the playback div would also narrow to stay within the browser's width zooming in. I would also appreciate if you used a heavier font weight, or permitted changing the font easily. It's a bit thin-looking and not easily taken in, at least for my eyes. This could also have applications in tutoring and teaching writing.