CSS - Percentages or Pixels?

Question

I have been using CSS for many years now, and I have always been a \'percentage\' kind of guy, as in I always define heights and widths using percentages as opposed to pixel

Answer 1

I like percentages too but it in certain cases it doesn't do what I expect. If for example i have two buttons sharing the same row with max-width: 50%, and the current viewport is not an even number, one of them will always be noticeably slightly larger.