        <!-- left menu starts -->
        <div class="col-sm-2 col-lg-2">
            <div class="sidebar-nav">
                <div class="nav-canvas">
                    <div class="nav-sm nav nav-stacked">

                    </div>
                    <ul class="nav nav-pills nav-stacked main-menu">
                        <li class="nav-header">Main</li>
                        <li><a class="ajax-link" href="#"><i class="glyphicon glyphicon-home"></i><span> Dashboard</span></a>
                        </li>
                    
                       
                       
                        <li class="nav-header hidden-md">Billing Section</li>
                    
                        
                 <li><a class="ajax-link" href="billdetail.php"><i class="glyphicon glyphicon-calendar"></i><span>Bill Detail</span></a>
                        </li>
                
                    </ul>
                   
                </div>
            </div>
        </div>
        <!--/span-->
        <!-- left menu ends -->