I've been trying to get my head around this issue with my blog for the last few days, and after trying out different themes, I realized the problem was linked to the CSS stylesheet of the theme I am using, which later on was confirmed by other having had the same problem.

Now, the thing is; I suck at CSS and can't find the bug by myself.
Any CSS expert in here willing to help me out on this?

Thanks in advance.
Alex.