JSFiddle - React, Tailwind, and code Playground

HTML

<nav id="main-navigation" class="navigation cf">
			<ul>
				<li><a href="/new/homepage" class="active-nav">Homepage</a></li><li><a href="/new/about">About Us</a><ul><li><a href="/new/the-company">The Company</a></li><li><a href="/new/testimonials">Testimonials</a></li><li><a href="/new/careers">Careers</a></li><li><a href="/new/the-company#meet-the-team">Meet The Team</a></li></ul></li><li><a href="/new/services">Services</a><ul><li><a href="/new/broadband">Broadband</a></li><li><a href="/new/telecoms">Telecoms</a><ul><li><a href="/new/hosted-ip-pbx">Hosted IP PBX</a><li><a href="/new/voip-telephone-numbers">Telephone Numbers</a><li><a href="/new/traditional-lines">Traditional Lines</a><li><a href="/new/telephone-systems">Telephone Systems</a></ul></li><li><a href="/new/it-support">I.T. Support</a></li><li><a href="/new/offsite-backup">Offsite Backup</a></li><li><a href="/new/web-hosting">Web Hosting</a></li><li><a href="/new/hosted-exchange">Hosted Exchange</a></li><li><a href="/new/networking">Networking</a></li><li><a href="/new/security">Security</a><ul><li><a href="/new/cctv-systems">CCTV Systems</a><li><a href="/new/access-control">Access Control</a></ul></li></ul></li><li><a href="/new/login">Login</a></li><li><a href="/new/online-shop">Online Shop</a><ul><li><a href="/new/online-shop/cart">Shopping Cart</a></li></ul></li><li><a href="/new/support">Support</a></li><li><a href="/new/contact">Contact Us</a></li>			</ul>
		</nav>

CSS

.navigation ul li {
    display: block;
    float: left;
    position: relative;
}

.navigation ul li a {
    font-size: 13px;
    font-weight: 700;
    color: #4d4d4d;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 0;
    text-transform: uppercase;
    border-bottom: 2px solid #fff;
    -webkit-transition: background-color .2s linear, padding-top .2s linear;
    -moz-transition: background-color .2s linear, padding-top .2s linear;
    -o-transition: background-color .2s linear, padding-top .2s linear;
    -ms-transition: background-color .2s linear, padding-top .2s linear;
    transition: background-color .2s linear, padding-top .2s linear;
    padding: 80px 9px 10px;
}

.navigation ul li a:hover,.navigation .active-nav {
    background-color: #F36F25; /*#373737;*/
    text-shadow: none;
    color: #f7f7f7!important;
    -webkit-box-shadow: 0 3px 0 #ff8833;
    box-shadow: 0 3px 0 #ff8833;
}

.navigation ul li a span {
    font-family: Arial, sans-serif;
    text-transform: uppercase;
    font-size: 9px;
    display: block;
    line-height: 14px;
    color: #9f9f9f;
}

.navigation ul .dropdown>a {
    background-color: #F36F25; /*#373737;*/
    text-shadow: none;
    color: #f7f7f7;
    -webkit-box-shadow: 0 3px 0 #ff8833;
    box-shadow: 0 3px 0 #ff8833;
}

.navigation ul ul {
    margin-top: 80px;
    position: absolute;
    top: -999em;
    width: 180px;
    background: #fff;
    border-top: 3px solid #ff8833;
    -webkit-box-shadow: 0 8px 6px -6px rgba(0, 0, 0, 0.4);
    -moz-box-shadow: 0 8px 6px -6px rgba(0, 0, 0, 0.4);
    box-shadow: 0 8px 6px -6px rgba(0, 0, 0, 0.4);
}

.navigation ul ul li a:hover {
    background-color: #F36F25; /*#373737;*/
    box-shadow: none;
}

.navigation ul {
    float: right;
    position: relative;
    z-index: 1200;
    margin-right: 15px;
}

.navigation-simple ul li {
    position: relative;
    display: inline-block;
    margin-left: 10px;
    padding: 6px;
}

.navigation-simple ul li a {
   ...