docs: def condense_hex_colors(css):
      """Shorten colors from #AABBCC to #ABC where possible."""
  
      regex = re.compile(r"([^\"'=\s])(\s*)#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])")
      match = regex.search(css)
      while match:
          first = match.group(3) + match.group(5) + match.group(7)
          second = match.group(4) + match.group(6) + match.group(8)
          if first.lower() == second.lower():
              css = css.replace(match.group(), match.group(1) + match.group(2) + '#' + first)
              match = regex.search(css, match.end() - 3)
          else:
              match = regex.search(css, match.end())
      return css