JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="container-fluid">
  <h2>Vertical Sidebar - Accordion Menu</h2>
  <hr>
  <div class="row">
    <div class="col-md-2">
      
      <!-- menu -->
      <div id="MainMenu">
        <div class="list-group panel">
          <a href="#" class="list-group-item list-group-item-success" data-parent="#MainMenu">Item 1</a>
          <a href="#" class="list-group-item list-group-item-success" data-parent="#MainMenu">Item 2</a>
          <a href="#demo3" class="list-group-item list-group-item-success" data-toggle="collapse" data-parent="#MainMenu">Item 3 <i class="fa fa-caret-down"></i></a>
          <div class="collapse" id="demo3">
            <a href="#SubMenu1" class="list-group-item" data-toggle="collapse" data-parent="#SubMenu1">Subitem 1 <i class="fa fa-caret-down"></i></a>
            <div class="collapse list-group-submenu" id="SubMenu1">
              <a href="#" class="list-group-item" data-parent="#SubMenu1">Subitem 1 a</a>
              <a href="#" class="list-group-item" data-parent="#SubMenu1">Subitem 2 b</a>
              <a href="#SubSubMenu1" class="list-group-item" data-toggle="collapse" data-parent="#SubSubMenu1">Subitem 3 c <i class="fa fa-caret-down"></i></a>
              <div class="collapse list-group-submenu list-group-submenu-1" id="SubSubMenu1">
                <a href="#" class="list-group-item" data-parent="#SubSubMenu1">Sub sub item 1</a>
                <a href="#" class="list-group-item" data-parent="#SubSubMenu1">Sub sub item 2</a>
              </div>
             ...

CSS

.list-group.panel > .list-group-item {
  border-bottom-right-radius: 4px;
  border-bottom-left-radius: 4px
}
.list-group-submenu {
  margin-left:20px;
}

JavaScript

$("#MainMenu").on('shown.bs.collapse', function () {
    var active = $("#MainMenu .in").attr('id');
    $.cookie('activeAccordionGroup', active);
});
$("#MainMenu").on('hidden.bs.collapse', function () {
    $.removeCookie('activeAccordionGroup');
});
var last=$.cookie('activeAccordionGroup');
if (last!=null) {
    $("#MainMenu .collapse").removeClass('in');
    $("#" + last).addClass("in");
}