Dear Sacred, thanks again! It worked beautifully.
Another question: I guess nobody guess the CSS of every particular theme.... is there a place where all these properties, values, selectors, etc. for each theme can be found? I mean the ones that are not included in the WP.com original CSS.
Sometimes it is a challenge the trial-error involved and it can even be fun; on the other hand, I know you guys are always there to help... but I'd really like to be able to do this by myself so I bother you guys less and less each time, if you understand what I mean. :-)