Recently was trying to work on Wordpress site that was passed on to me, and it has a page that uses this plug-in and this one. The former provides an excerpt of the child-page for viewing purposes on the parent page.

So on the WordPress page editor, in Text, there is this code there:

[child_pages width="25%"]

Would it be possible to add a hover capability to those blocks, where if you hover over one of them, there would be an overlay that then turns visible, with text on it? (to provide more information about the block) And how would I do it? CSS? how would I access the CSS-- would it be the theme's CSS, or the plug-in's?