Change elements spacing

Hi Emil,

I am customizing a little bit the theme I am making a king of photo galerie. The pictures are inside tables like this

table 1 : phtotoA ,photoB
table 2 : photoC, photoD, photoE

Whitch CSS I have to change in order to have less space Beetween table 1 and table 2

By the way : I edit my table inside the html view and sometimes when I switch to visual Booom the tables disepears

Thanks