Here, each container has an outline so you can clearly see its extent. It looks slightly different in each browser - but not much.
The text should appear when you place the pointer over each box, and the size of the heading should change.
When a pointer hovers over the white-space of the block containing the link, you should be able to access the link.

Section 1

text

Section 2

text

Section 3

text

Section 4

text