$(document).ready(function(){
     //jquery for toggle sub menus
     $('.sub-btn').click(function(){
       $(this).next('.sub-menu').slideToggle();
       $(this).find('.dropdown').toggleClass('rotate');
     });

     //jquery for expand and collapse the sidebar
     $('.menu-btn').click(function(){
       $('.side-bar').addClass('active');
       $('.menu-btn').css("visibility", "hidden");
     });

     $('.close-btn').click(function(){
       $('.side-bar').removeClass('active');
       $('.menu-btn').css("visibility", "visible");
     });
   });