I am having a similar problem with my page and the CSS margin code you provided seems to do nothing.
I have two tables with 2 columns and 1 row each. I used a 2×2 table bfore, but wanted to stagger/modify the width of each cell according to row. I have that effect that I want, but I wish to remove the spaces from the in between the two tables (or if there is an easy way to control each individual cell’s width in a single table according to row, I would love that too!)
http://holyrollertheseries.com/ <—- site link
PLEASE ADVISE!