code: function(options) {
          var webkitScrollbarRules = builder.createWebkitScrollbarRules('.' + classNameConst.CONTAINER, options);
          var ieScrollbarRule = builder.createIEScrollbarRule('.' + classNameConst.CONTAINER, options);
          var xInnerBorderRule = classRule(classNameConst.BORDER_BOTTOM).bg(options.border);
          var xOuterBorderRule = classRule(classNameConst.CONTENT_AREA).border(options.border);
          var yInnerBorderRule = classRule(classNameConst.SCROLLBAR_Y_INNER_BORDER).bg(options.border);
          var yOuterBorderRule = classRule(classNameConst.SCROLLBAR_Y_OUTER_BORDER).bg(options.border);
          var spaceRightTopRule = classRule(classNameConst.SCROLLBAR_RIGHT_TOP)
              .bg(options.emptySpace)
              .border(options.border);
          var spaceRightBottomRule = classRule(classNameConst.SCROLLBAR_RIGHT_BOTTOM)
              .bg(options.emptySpace)
              .border(options.border);
          var spaceLeftBottomRule = classRule(classNameConst.SCROLLBAR_LEFT_BOTTOM)
              .bg(options.emptySpace)
              .border(options.border);
          var frozenBorderRule = classRule(classNameConst.SCROLLBAR_FROZEN_BORDER)
              .bg(options.emptySpace)
              .border(options.border);
  
          return builder.buildAll(webkitScrollbarRules.concat([
              ieScrollbarRule,
              xInnerBorderRule,
              xOuterBorderRule,
              yInnerBorderRule,
              yOuterBorderRule,
              spaceRightTopRule,
              spaceRightBottomRule,
              spaceLeftBottomRule,
              frozenBorderRule
          ]));
      }
docs: Generates a css string for scrollbars.
  @param {Object} options - options
  @returns {String}