On the nojs library page the download button click area is misleading

[veloman-yunkan]

This issue is introduced by #1094 (not yet merged as of filing this issue).

In no-JS mode (/nojs) download buttons on the book tiles slightly misbehave. The button invites clicking it anywhere in the button area (since it becomes darker and the mouse cursor changes when hovering over any region of the button rect) however the clicks only work on the text of the button. There is no such issue in JSful mode.