Hello - I would like to add a border/background/wrapper (I'm not sure which is the right term) to the main post and sidebar areas. The two blogs below are very similar in how they've done this, in adding a double-border shaded area behind the main posts and sidebar. This sets these areas apart from the overall background color.
I would like my blog to have a similar format, but can't figure out how to do it! Thanks so much!
The blog I need help with is kentsanders.net.