Sidebar encroachs on content space

I know I want the 3 columns of my blog to not feel too restricted so they look good no matter who opens them up. But that’s not happening. Look at https://www.vbdems.org! There’s all sorts of space invasions to poor content from both the left and the right! I’ve looked at width in both content and sidebar is stylesheet. I’ve increased and decreased those number and NOTHING HAPPENS!