JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="toggle">
    <li>
<a href="#">Menu</a>

        <ul id="dropdown" class="dropdown-menu" role="menu">
            <li><a href="#">2017</a>
            </li>
            <li><a href="#">2012</a>
            </li>
            <li><a href="#">2003</a>
            </li>
        </ul>
    </li>
    <li><a href="#">Contact</a>
    </li>
</ul>

CSS

#toggle {
    list-style-type: none;
    margin: 0;
    padding:0;
    text-align:left;
    line-height:2.5em;
    font-size: 1.0em;
    text-transform:uppercase;
    font-style:normal;
}
#toggle li {
    padding:0;
    margin:0;
    vertical-align:top;
    float:left;
    position:relative;
}
#toggle li a {
    background-color:#222;
    margin:0 1px 0 0;
    padding:8px 17px;
    color:#fff;
    font-weight:300;
    text-decoration:none;
}
#toggle li ul {
    list-style-type: none;
    left:0;
    position:absolute;
    visibility:hidden;
}
#toggle li.open ul {
    visibility:visible;
}

JavaScript

$(document).ready(function () {
    $('#toggle li').on('click', function () {
        $(this).toggleClass('open');
    });
});