Custom Scrollbar WIth JS

 <link rel="stylesheet" type="text/css" href="https://malihu.github.io/custom-scrollbar/jquery.mCustomScrollbar.min.css"></link>

<script type="text/javascript" src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<script type="text/javascript" src="https://malihu.github.io/custom-scrollbar/jquery.mCustomScrollbar.concat.min.js"></script>

<script type="text/javascript">
    (function($){
        $(window).on("load",function(){
            $(".content").mCustomScrollbar();
        });
    })(jQuery);
</script>