CSS has been my nemesis.

For everything CSS fixes, it breaks something else.

Kinda like the old nursery rhyme about the old lady who swallowed a fly (then she had to swallow a spider to catch the fly, and something else to catch the spider, and something else to catch that.)

It's the same with CSS - a class for borders, a class to undo the borders, a class to undo the undo, etc.