JSFiddle - React, Tailwind, and code Playground

HTML

<header>
            <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>
                        ...

CSS

* {
    box-sizing: border-box;
}

body {
    background: #fff;
    margin: 0;
    padding: 0;
}

main, footer {
    margin: 0;
    padding: 20px;
    float: left;
    width: 100%;
}

p, h1 {
    margin-left: auto;
    margin-right: auto;
    width: 80%;
}

main {
    border: 0 solid #d9d9d9;
    border-width: 3px 0;
    background: #eee;
}

header, footer {
    background: #fff;
    text-align: right;
}

.navigation {
    background: #fff;
    float: right;
    width: 100%;
}

.navigation ul {
    background: #fff;
    border: 0 solid #ff8833;
    margin: 0 15px 0 0;
    padding: 0;
    float: right;
    position: relative;
    z-index: 1200;
}

.navigation li ul {
    position: absolute;
    left: 0;
    top: -999em;
    z-index: 99;
    width: 210px;
    border-width: 3px 0 0 0;
    -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 li li ul {
    border-width: 0;
    left: 100%;
}

.navigation li:hover > ul {
    top: 6.75em;
}

.navigation li li:hover > ul {
    top: 0;
}

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

.navigation li li {
    width: 100%;
}

.navigation li a {
    text-align: left;
    font-size: 13px;
    font-weight: 700;
    color: #4d4d4d;
    text-decoration: none;
    display: inline-block;
    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 li:hover > a,.navigation .active-nav {
    background-color: #F36F25;
    color: #f7f7f7;
    -webkit-box-shadow: 0 3px 0...