JSFiddle - React, Tailwind, and code Playground

HTML

<div class="toolmenu" style="min-width:800px">
    <ul>
        <li><a class="dropdown left" href="#">Main A</a></li>
    </ul>
    <ul>
        <li><a class="dropdown right" href="#">Main B<span class="tm-arrow">&#9660;</span></a>
            <ul class="tm-width-2">
                <li><a href="#">Sub i</a></li>
                <li><a href="#">Sub ii</a></li>
                <li><a href="#">Sub iii</a></li>
                <li><a href="#">Sub iv</a></li>
            </ul>
        </li>
    </ul>                   
</div>

<div style="clear:both"></div>
<div id='status'></div>

CSS

.toolholder 
{
    margin-left:0px;
    margin-bottom: 5px;
}
.toolmenu * 
{
    margin:0px;
    padding:0px;
    background-color: white;
    z-index:9;
}
.toolmenu {
    height:24px;
    font-size:16px;
    color:#FFF;
    margin:0 auto;    
}
.toolmenu ul {
    list-style:none;
    width:auto;
}
.toolmenu ul li {
    float:left;
    position: relative;
}
.toolmenu ul li a {
    color:#666;
    font:bold 75% arial,sans-serif;
    text-decoration:none;
    padding:5px 12px;
    position:relative;
    display:inline-block;
    /*Background*/
    background:#f3f3f3;
    background:-webkit-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    /*linear-gradient*/
    background:-webkit-gradient(linear,left top,left bottom,from(from(#F5F5F5)),to(to(#F1F1F1)));
    background:-webkit-linear-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    background:-moz-linear-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    background:-o-linear-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    background:linear-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    border:solid 1px #dcdcdc;
    /*border-radius*/
    -webkit-border-radius:2px;
    -moz-border-radius:2px;
    border-radius:2px;
    margin-right:10px;
}
.toolmenu ul li a.nodrop {
    margin-right:0px;
}
.toolmenu ul li a:hover {
    color:#333;
    border-color:#999;
    /*box-shadow*/
    -webkit-box-shadow:0 2px 0 rgba(0,0,0,0.2) -webkit-box-shadow:0 2px 5px rgba(0,0,0,0.2);
    -moz-box-shadow:0 2px 0 rgba(0,0,0,0.2) -moz-box-shadow:0 2px 5px rgba(0,0,0,0.2);
    box-shadow:0 2px 0 rgba(0,0,0,0.2) box-shadow:0 2px 5px rgba(0,0,0,0.2);
}
/* styling for the left buttons(buttons which are joined)*/
.toolmenu ul li a.left {
    -webkit-border-top-right-radius:0;
    -moz-border-radius-topright:0;
    border-top-right-radius:0;
    -webkit-border-bottom-right-radius:0;
    -moz-border-radius-bottomright:0;
    border-bottom-right-radius:0;
    margin: 0;
}
/* styling...

JavaScript

$('a').click(function() { 
    $('#status').append("Click! - " + $(this).text() + "<br />");
});

$('div.toolmenu ul li ul li a').click(function () {
    var grand = $(this).parent().parent();
    grand.hide();
    setInterval(function () {
        grand.css('display', '');
    }, 300);
});