The button appears to be hover only, which bad. On top of that, it expands content down to show the chapters, but if you move over and then down (instead of dow

The button appears to be hover only, which bad. On top of that, it expands content down to show the chapters, but if you move over and then down (instead of down then over), you exit the hover area and it closes. There are no visual indications of the boundaries of the hover area.