ar-levels" class="collapse">
                            <li><a href="#">Level 1</a></li>
                            <li>
                                <a class="collapsed" href="#sidebar-sub-levels" data-toggle="collapse" data-parent="#sidebar-levels">
                                    Level 2
                                    <i class="toggle fa fa-angle-down"></i>
                                </a>
                                <ul id="sidebar-sub-levels" class="collapse">
                    