Index: reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss
===================================================================
diff -u -r735a9c9c63b803e860d5204891e8d50a3ace6366 -r4e3f35baa8bcdfa56a0cdb9587ba617734b5db94
--- reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss	(.../layout.scss)	(revision 735a9c9c63b803e860d5204891e8d50a3ace6366)
+++ reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss	(.../layout.scss)	(revision 4e3f35baa8bcdfa56a0cdb9587ba617734b5db94)
@@ -808,6 +808,10 @@
 	var reg = /[\{\}\[\]\/?.,;:|\)*~`!^\-_+<>@\#$%&\\\=\(\'\"]/gi;
 	var jQueryElementStr = jQueryElementID.replace(reg, "");
 
+	if ( isEmpty(scrollY) ){
+		scrollY = 800;
+	}
+
 	var responsiveRender = {
 		details: {
 			renderer: function (api, rowIdx, columns) {
@@ -856,15 +860,16 @@
 		stateDuration: -1,
 		destroy: true,
 		processing: true,
-		scrollX: true,
 		responsive: false,
 		columns: columnList,
 		rowsGroup: rowsGroupList,
 		columnDefs: columnDefList,
 		select: selectList,
 		order: orderList,
 		buttons: buttonList,
+		scrollX: true,
 		scrollY: scrollY,
+		scroller: true,
 		language: {
 			processing: "",
 			loadingRecords: