script.js

   var slidebar_width  = jQuery(window).width(); //slidebar width + padding size
   var slide_bar       = jQuery(".side-menu-wrapper"); //slidebar
   var slide_open_btn  = jQuery(".slide-menu-open"); //slidebar close btn
   var slide_close_btn = jQuery(".menu-close"); //slidebar close btn
   var overlay         = jQuery(".side-menu-overlay"); //slidebar close btn

   slide_open_btn.click(function(e){
       e.preventDefault();
       slide_bar.css( {"left": "0px"}); //change to "right" for right positioned menu
       overlay.css({"opacity":"1", "width":"100%"});
   });

   slide_close_btn.click(function(e){
       e.preventDefault();
       slide_bar.css({"left": "-"+ slidebar_width + "px"}); //change to "right" for right positioned menu
       overlay.css({"opacity":"0", "width":"0"});
   });

   jQuery('.button__subcategories').on('click', function() {
       if(!jQuery(this).parent().hasClass('on__submenu')) {
           jQuery(this).parent().addClass('on__submenu');
       } else {
           jQuery(this).parent().removeClass('on__submenu');
       }
   });