I need a sidebar to stretch down as much as its container div does. I haven't set a height for the container because I want it to be as tall as whatever content goes in it. I wanted the sidebar to be height:100% but since I haven't set the container height, it's still on 'auto', so that doesn't work.

How do you get a sidebar height to be 100% of its container, while keeping the container fluid?

(Sorry I can't post markup and css to explain what I mean yet, I will soon if needed... but I'll have to make a whole new example page for that + I'm a bit busy right now. )