I have 2 divs. Second is under first.

2nd div has z-index: -1; top: -20px; position: relative. Now I want to put some links(a-tag) into 2nd div: <a href="#">test</a>. Now I see my link but it’s inactive. I can’t click at it. When I remove z-index: -1 it works. What’s wrong?
A negative z-index can behave buggy. I would give the top div a higher z-index. You can better have something like this:
You’re links should be clickable, if they are visible of course.