JSFiddle - React, Tailwind, and code Playground

HTML

<div id="accordian">
    <ul>
        <li>
            <h3><span class="icon-dashboard"></span><a href="#">Dashboard</a></h3>
            <ul>
                <li><a href="#">Reports</a></li>
                <li><a href="#">Search</a></li>
                <li><a href="#">Graphs</a></li>
                <li><a href="#">Settings</a></li>
            </ul>
        </li>
        <!-- we will keep this LI open by default -->
        <li class="active">
            <h3><span class="icon-tasks"></span><a href="#">Tasks</a></h3>
            <ul>
                <li><a href="#">Today's tasks</a></li>
                <li><a href="#">Urgent</a></li>
                <li><a href="#">Overdues</a></li>
                <li><a href="#">Recurring</a></li>
                <li><a href="#">Settings</a></li>
            </ul>
        </li>
        <li>
            <h3><span class="icon-calendar"></span><a href="#">Calendar</a></h3>
            <ul>
                <li><a href="#">Current Month</a></li>
                <li><a href="#">Current Week</a></li>
                <li><a href="#">Previous Month</a></li>
                <li><a href="#">Previous Week</a></li>
                <li><a href="#">Next Month</a></li>
                <li><a href="#">Next Week</a></li>
                <li><a href="#">Team Calendar</a></li>
                <li><a href="#">Private Calendar</a></li>
                <li><a href="#">Settings</a></li>
            </ul>
        </li>
        <li>
            <h3><span class="icon-heart"></span><a href="#">Favourites</a></h3>
            <ul>
                <li><a href="#">Global favs</a></li>
                <li><a href="#">My favs</a></li>
                <li><a href="#">Team favs</a></li>
                <li><a href="#">Settings</a></li>
            </ul>
        </li>
    </ul>
</div>

CSS

@import url(http://fonts.googleapis.com/css?family=Nunito);
            /*CSS file for fontawesome - an iconfont we will be using. This CSS file imported contains the font-face declaration. More info: http://fortawesome.github.io/Font-Awesome/ */
        @import url(http://thecodeplayer.com/uploads/fonts/fontawesome/css/font-awesome.min.css);

            /*Basic reset*/
        * {
            margin: 0;
            padding: 0;
        }

        body {
            margin: 0;
            padding: 0;
            background-color: #333333;
            font-family: Arial, Helvetica, sans-serif;
        }

        #accordian {
            background: #92B83E;
            width: 210px;
            margin: 100px auto 0 auto;
            color: white;
            /*Some cool shadow and glow effect*/
            /*box-shadow:*/
            /*0 5px 15px 1px rgba(0, 0, 0, 0.6),*/
            /*0 0 200px 1px rgba(255, 255, 255, 0.5);*/
        }

            /*heading styles*/
        #accordian h3 {
            font-size: 12px;
            line-height: 34px;
            padding: 0 10px;
            cursor: pointer;
            /*fallback for browsers not supporting gradients*/
            background: #74923C;
            /*background: linear-gradient(#003040, #002535);*/
        }

            /*heading hover effect*/
        #accordian h3:hover {
            /*text-shadow: 0 0 1px rgba(255, 255, 255, 0.7);*/
            color: #74923C;
            background: #ffffff;
        }

            /*iconfont styles*/
        #accordian h3 span {
            font-size: 16px;
            margin-right: 10px;
        }

            /*list items*/
        #accordian li {
            list-style-type: none;
        }

            /*links*/
        #accordian ul ul li a {
            color: white;
            text-decoration: none;
            font-size: 11px;
            line-height: 27px;
            display: block;
            padding: 0 15px;
            /*transition for smooth...

JavaScript

$(document).ready(function () {
            $("#accordian h3").click(function () {
                //slide up all the link lists
                $("#accordian ul ul").slideUp();
                //slide down the link list below the h3 clicked - only if its closed
                if (!$(this).next().is(":visible")) {
                    $(this).next().slideDown();
                }
            });

            $('#accordian h3').click(function () {
                $(this).addClass("active1")
            });
        });