sidebar white space

Hi! On my static front page I decided to put the sidebar with customized menu, because if I don’t, there will be a lot of white space on the right side doing nothing. But the problem is, it is there on every page! I just want to have the side menu on the first page. If there is no way of doing this, can I do something about the dead space on the right side, maybe increase the width on that side?

Thanks!