scrollbarWidth = outer.offsetWidth - borderWidth - outer.clientWidth;198                if (scrollbarWidth == 0) return offset;

   	<script><![CDATA[ 
		zk.afterLoad("zkmax.nav", function () {
		    var _xAnchornav = {};
		    zk.override(zkmax.nav.Anchornav.prototype, _xAnchornav, {
		        _scrollIntoViewTop(outer, inner, offset) {
		            if (outer && inner) {
		                if (outer == document) return offset;
		                let newScrollTop = -1;
		                if (outer != document.body) {
		                    //check if outer has vertical scrollbar
		                    const borderWidth = Math.round(jq.css(outer, 'borderLeftWidth', true))
		                        + Math.round(jq.css(outer, 'borderRightWidth', true)),
		                        scrollbarWidth = outer.offsetWidth - borderWidth - outer.clientWidth;
		                    const toOuterOffset = jq(inner).offset().top - jq(outer).offset().top;
		                    if (toOuterOffset == 0) return offset; // in the view top of outer

		                    newScrollTop = outer.scrollTop + toOuterOffset;
		                    offset = offset - toOuterOffset;
		                } else {
		                    outer = zk.safari ? 'body' : 'html';
		                    newScrollTop = jq(outer).scrollTop() + offset;
		                    const maxScrollTop = jq(document).height() - jq(window).height();
		                    if (newScrollTop > maxScrollTop) newScrollTop = maxScrollTop;
		                    offset = 0;
		                }
		                if (jq(outer)[0].scrollTop != newScrollTop)
		                    jq(outer).animate({
		                        scrollTop: newScrollTop
		                    }, zk(this).getAnimationSpeed(500));
		                return offset;
		            }
		        }
		     });
		});
	]]></script>