JSFiddle - React, Tailwind, and code Playground

HTML

<div class="nav-wrap">
    <ul class="navigation-bar">
        <li><a href="#">Home</a>

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

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

        </li>
        <li>	<a href="#">DESC Squad</a>

            <!-- <ul class="menu">-->
            <ul>
                <li><a href="#">Swim Squad</a>

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

                </li>
                <li class="drop"><a href="#">Sub menu 1</a>

                    <ul>
                        <li><a href="#">Sub menu 2.1 </a>

                        </li>
                        <li><a href="#">Sub menu 2.2 </a>

                        </li>
                        <li><a href="#">Sub menu 2.3 </a>

                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li>	<a href="#">DESS Squad</a>

            <ul>
                <li><a href="#">Swim Squad</a>

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

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

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

        </li>
    </ul>
</div>

CSS

.nav-wrap {
    background-color: #125CC1;
    text-align: center;
}
ul.navigation-bar li a {
    display:block;
    color: #FFFFFF;
    background-color: #125CC1;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    line-height:28px;
    font-size: 12px;
}
ul.navigation-bar li a:hover {
    background-color: #06398F;
}
ul.navigation-bar {
    text-align: left;
    display: inline;
    margin: 0;
    list-style: none;
}
ul.navigation-bar li {
    line-height:28px;
    position: relative;
    display: inline-block;
    width: 120px;
    font-weight: bold;
    color: #FFFFFF;
    background-color: #125CC1;
    text-align: center;
}
ul.navigation-bar li ul {
    padding: 0;
    position: absolute;
    top: 28px;
    left: 0;
    width: 120px;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
    display: none;
    opacity: 0;
    visibility: hidden;
    -webkit-transiton: opacity 0.2s;
    -moz-transition: opacity 0.2s;
    -ms-transition: opacity 0.2s;
    -o-transition: opacity 0.2s;
    -transition: opacity 0.2s;
}
ul.navigation-bar li ul li {
    background: #125CC1;
    display: block;
    color: #fff;
}
ul.navigation-bar li ul li:hover {
    background: #06398F;
    color: #fff;
}
ul.navigation-bar li:hover > ul {
    display: block;
    opacity: 1;
    visibility: visible;
    position: absolute;
}
/*2-nd level */
 ul.navigation-bar ul ul {
    position: absolute;
    top: 0;
    left: 100%;
    display: none;
}
ul#nav ul li:hover ul {
    display: block;
}