This is the fun part of programming! Maybe to be consistant black for all borders. You're doing fine and all the minor details will work out. I like swatch 7. But, have some fun, make everything white. hehehe.
So far, blue, gray, camouflage, and swatch 7 are keepers. And the experiment in underlining has thankfully failed.
But I can't find another color scheme, even the San Francisco Magenta, that works for my other sidebar.