JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<header>
        <div class="logo"><a href="#">WORKOUT <span>FITNESS CENTER</span></a></div>
    </header>
    <div id="container">
        <nav>
            <ul>
                <li><a href="#">Walk-In</a></li>
                <li class="has-sub"><a href="#">Members</a>             
                     <ul>
                            <li><a href="#">Subscr</a></li>
                            <li><a href="#">asdasd</a></li>
                            <li><a href="#">asdasd</a></li>
                      </ul>       
                </li>
                <li><a href="#">Sales</a></li>
                <li><a href="#">Inventory</a></li>
                <li><a href="#">Suppliers</a></li>
                <li><a href="#">Reports</a></li>
            </ul>
        </nav>

        <div id="content">
            SOME CONTENT YAY
        </div>
    </div>

CSS

@import url(https://fonts.googleapis.com/css?family=Open+Sans:400italic,400,300italic,300);
*{
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Open Sans';
}

a{
    text-decoration: none;
}

header{
    width: 100%;
    height: 50px;
    border-bottom: 1px solid #858585;
}

.logo {
    float: left;
    margin-top: 9px;
    margin-left: 15px;  
}

.logo a{
    font-size: 1.3em;
    color: #070807;

}
.logo a span{
    font-weight: 300;
    color: #1AC93A;
}

nav{
    width: 250px;
    height: calc(100% - 50px);
    background-color: #171717;
    float: left;
}

#content {
    width: :auto;
    margin-left: 250px;
    height: calc(100% - 50px);
    padding: 15px
}

nav li{
    list-style: none;

}

nav li a{
    color: #ccc;
    display: block;
    padding: 10px;
    font-size: 0.8em;
    border-bottom: 1px solid #0a0a0a;
    -webkit-transition: 0.2s;
    -moz-transition: 0.2s;
    -o-transition: 0.2s;
    transition: 0.2s;
}

nav li a:hover{
    background-color: #030303;
    color: #fff;
    padding-left: 80px;
}

nav ul li ul {
    display: none;
}

/*nav ul li:hover > ul{
    display: block;

}*/

nav ul li.tap > ul{
    display: block;
}

JavaScript

$(document).ready(function(e)
    {
        $('.has-sub').click(function(){
            $(this).toggleClass('tap')
        });
		$('.has-sub ul').click(function(){
            return false
        });
    });