JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<div class="col-md-3 column margintop20">
    <ul class="nav nav-pills nav-stacked">
        <li class="dropdown-submenu"><a href="#">Option 1<span class="glyphicon glyphicon-chevron-right pull-right"></span> </a>

            <ul class="dropdown-menu">
                <li><a href="#">Child1</a>
                </li>
                <li><a href="#">Child2</a>
                </li>
                <li><a href="#">Child3</a>
                </li>
                <li><a href="#">Child4</a>
                </li>
                <li><a href="#">Child5</a>
                </li>
            </ul>
        </li>
        <li class="dropdown-submenu"><a href="#">Option 2<span class="glyphicon glyphicon-chevron-right pull-right"></span> </a>

            <ul class="dropdown-menu">
                <li><a href="#">Child1</a>
                </li>
                <li><a href="#">Child2</a>
                </li>
                <li><a href="#">Child3</a>
                </li>
                <li><a href="#">Child4</a>
                </li>
                <li><a href="#">Child5</a>
                </li>
            </ul>
        </li>
        <li class="dropdown-submenu"><a href="#">Option 3<span class="glyphicon glyphicon-chevron-right pull-right"></span> </a>

            <ul class="dropdown-menu">
                <li><a href="#">Child1</a>
                </li>
                <li><a href="#">Child2</a>
                </li>
                <li><a href="#">Child3</a>
                </li>
                <li><a href="#">Child4</a>
                </li>
                <li><a href="#">Child5</a>
                </li>
            </ul>
        </li>
        <li class="dropdown-submenu"><a href="#">Option 4<span class="glyphicon glyphicon-chevron-right pull-right"></span> </a>

            <ul...

CSS

/****  Sub DropDown Menus ****/
 .dropdown-submenu {
    position: relative;
}
.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 10%;
    margin-top: -6px;
    margin-left: -1px;
    -webkit-border-radius: 0 6px 6px 6px;
    -moz-border-radius: 0 6px 6px;
    border-radius: 0 6px 6px 6px;
}
.dropdown-submenu:hover > .dropdown-menu {
    display: block;
}
.dropdown-submenu > a:after {
    display: block;
    content:" ";
    float: right;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 5px 0 5px 5px;
    border-left-color: #ccc;
    margin-top: 5px;
    margin-right: -10px;
}
.dropdown-submenu:hover > a:after {
    border-left-color: #fff;
}
.dropdown-submenu.pull-left {
    float: none;
}
.dropdown-submenu.pull-left > .dropdown-menu {
    left: -100%;
    margin-left: 10px;
    -webkit-border-radius: 6px 0 6px 6px;
    -moz-border-radius: 6px 0 6px 6px;
    border-radius: 6px 0 6px 6px;
}