code: function(content, pos) {
  			if (typeof content === 'string') {
  				content = this.findAllRules(content);
  			}
  
  			var rules = content.filter(function(r) {
  				return r.inside(pos);
  			});
  
  			return utils.last(rules);
  		}
docs: Search for nearest CSS rule/section that contains
  given position
  @param  {String} content CSS content or matched CSS rules (array of ranges)
  @param  {Number} pos     Search position
  @return {Range}