JSFiddle - React, Tailwind, and code Playground

HTML

<div class="top-menu">
    <ul id="nav">
        <li><a class="first-top" href="#">HOME</a>

        </li>
        <li><a href="#">DIRECTORY</a>

        </li>
        <li><a href="#">OFFICES</a>

            <ul class="child">
                <li><a href="#">MIAMI</a>

                </li>
                <li><a href="#">FORT LAUD</a>

                </li>
                <li><a href="#">TAMPA</a>

                </li>
                <li><a href="#">TALLAHASSEE</a>

                </li>
            </ul>
        </li>
        <li><a href="#">MENUS</a>

            <ul class="child">
                <li><a href="#">MIAMI</a>

                </li>
                <li><a href="#">FORT LAUD</a>

                </li>
                <li><a href="#">TAMPA</a>

                </li>
                <li><a href="#">TALLAHASSEE</a>

                </li>
            </ul>
        </li>
        <li><a href="#">CONFERENCE</a>

            <ul class="child">
                <li><a href="#">LOG IN</a>

                </li>
                <li><a href="#">TUTORIALS</a>

                </li>
            </ul>
        </li>
        <li><a href="#">FLOORS</a>

            <ul class="child">
                <li><a href="#">MIAMI</a>

                    <ul>
                        <li><a href="#">1ST&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">2ND&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">3RD&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">20TH&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">21ST&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">22ND&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">23RD&nbsp;FLOOR</a>

                        </li>
                        <li><a href="#">24TH&nbsp;FLOOR</a>

                        </li>
 ...

CSS

.top-menu {
    height:95px;
    width:640px;
    float:left;
    vertical-align:top;
}
#nav {
    margin-top:44px;
    display: block;
    height: 35px;
    width: 640px;
}
#nav li {
    float: left;
    display: block;
}
#nav li a, #nav li a.first-top {
    font:bold 11px Verdana;
    text-decoration: none;
    cursor:pointer;
    text-align:left;
    color: #7a913f;
}
#nav li a {
    margin-left:44px;
}
#nav li a.first-top {
    margin-left:12px;
}
#nav li a:hover {
    color: #654e32;
    text-decoration: none;
}
/* Targeting the first level menu */
 #nav li ul {
    background-color:#f2eee5;
    border-left: solid 1px #EAE3D9;
    border-right: solid 1px #EAE3D9;
    border-bottom: solid 1px #EAE3D9;
    display: none;
    margin: 0 0 0 20px;
    padding: 5px 0 0 0;
    text-align: left;
    position: absolute;
    z-index: 1;
}
#nav li ul li {
    clear:both;
    display: block;
    padding: 6px 13px;
}
#nav li ul li a {
    margin: 0;
}
/* Targeting the second level menu */
 #nav li ul li ul {
    background-color:#f2eee5;
    border: solid 1px #EAE3D9;
    display: none;
    margin: 0 0 0 100px;
    padding: 0;
    text-align: left;
    position: absolute;
    z-index:-2;
}
/* A class of current will be added via jQuery */
 #nav li.current > a {
    background: transparent;
}
/* CSS fallback */
 #nav li:hover > ul.child {
    display: block;
}
#nav li:hover > ul.grandchild {
    display: block;
}

JavaScript

// Document Listening
$(document).ready(function () {

    // JQuery running fine, don't need CSS trick for dropdown
    // Remove the class of child and grandchild, this removes the CSS 'falback'
    $("#nav ul.child").removeClass("child");
    $("#nav ul.grandchild").removeClass("grandchild");

    // When a list item that contains an unordered list is hovered on
    $("#nav li").has("ul").click(function (e) {
        $("#nav li").children("ul").not($(this).parents()).slideUp("fast");
        $(this).children("ul").slideDown("fast");
        e.stopPropagation();
    });

});

// Document Click 
// Click on anything else other then the link you clicked and close
$(document).mouseup(function (event) {
    if (!$(event.target).closest("#nav li").length) {
        $("#nav li").children("ul").slideUp("fast");
    }
});