Reduce sidebar width

Hi there,

How do you reduce the sidebar width (both left and right as-is, one below the other all on the left) ?

Looking at the CSS, I tried to reduce the #sidebar {} width: 228px down to, say, 180, but that just cut through the top bar's content (the blocks are not being reduced), and the bottom sidebar is being shifted to the left out of the screen, instead of being reduced.

Thanks.