Add a border around multiple blocks

Add a border around multiple blocks

Often I would like to indicate that multiple blocks are related by adding a border around them - something visually more significant than a section break. Seems like this should be pretty easy to do, and I'm frustrated that I can't do it.

In the meantime I've come up with this layout I'm calling "Super Quote" - basically two columns with just a background color in the left column and multiple content blocks in the right column. I'd like to be able to make the left column even more narrow, as well.