Hi, I am using twenty twelve for my site. I have problems eliminating gaps between posts. Please have a look at fiorita.cz/novinky/ and see the problem.
I also would like to eliminate space above the header and make the navigation menu narrower.
I do not have much experience with CSS and now edit the appearance of my site on trial-and-mistake basis mostly, so any help and advice is much appreciated
Yours, Fiorita :-))