code: def get_mark_css(aes_name, css_value):
      
      css_prop = AES_CSS_MAP[aes_name]
      if isinstance(css_value, list):
          return get_mark_css_for_rules(aes_name, css_prop, css_value)
      else:
          return get_mark_simple_css(aes_name, css_prop, css_value)
docs: Generate CSS class for <mark> tag.
  
      Parameters
      ----------
      aes_name: str
          The name of the class.
      css_value: str
          The value for the CSS property defined by aes_name.
  
      Returns
      -------
      list of str
          The CSS codeblocks