JSFiddle - React, Tailwind, and code Playground

HTML

<div class="aac-header-wrap">
    <ul id="main-menu" class="links inline clearfix aac-main-menu">
        <li class="menu-315 first"><a href="/reijon-page">Front page</a></li>
        <li class="menu-322 active-trail active"><a href="/node/13" class="active-trail active">News</a></li>
        <li class="menu-323"><a href="/node/15">Health</a></li>
        <li class="menu-325"><a href="/node/17">Travel</a></li>
        <li class="menu-324 last"><a href="/node/16">Viewpoints</a></li>
    </ul> <div class="clearfix"></div>
</div>

CSS

.aac-header-wrap {
    margin-bottom: 10px;
    height: 26px;
}

.aac-header-wrap ul.inline li {
    padding: 0px;
    margin: 0px;
    display: inline;
    float: left;
}

.aac-main-menu li a {
    text-decoration: none;
    background: #D63535;
    background: -webkit-gradient(linear, left top, left bottom, from(rgb(214, 53, 53)), to(rgb(170, 30, 30)));
    background: -moz-linear-gradient(top,  #D63535,  #AA1E1E);
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#D63535', endColorstr='#AA1E1E');
    text-transform: uppercase;
    font-weight: bold;
    font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif;
    line-height: 12px;
    color: #FFF;
    display: inline-block;
    font-size: 11px;
    padding: 7px 11px;
    margin-right: 1px;
    -moz-box-shadow: 0 1px 3px #999;
    -webkit-box-shadow: 0 1px 3px #999;
    box-shadow: 0 1px 3px #999;
    text-shadow: 0px -1px 1px rgba(0,0,0,0.2);
    outline: none;
}

.aac-main-menu li.active a {
    position: relative;
    -webkit-border-top-left-radius: 6px;
    -webkit-border-top-right-radius: 6px;
    -moz-border-radius-topleft: 6px;
    -moz-border-radius-topright: 6px;
    color: #fff;
    background: #BB2323;
    bottom: 4px;
    padding-bottom: 9px;
    padding-top: 9px;
    position: relative;
}

.aac-main-menu a:hover {
    text-decoration: none;
    color: #FFF;
    background: #BB2323;
    background: #D63535;
    background: -webkit-gradient(linear, left top, left bottom, from(#BA1E1E), to(#6D3535));
    background: -moz-linear-gradient(top,  #AA1E1E,  #AA1E1E);
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#AA1E1E', endColorstr='#AA1E1E');
}

.aac-main-menu li.first a {
    -webkit-border-top-left-radius: 4px;
    -webkit-border-bottom-left-radius: 4px;
    -moz-border-radius-topleft: 4px;
    -moz-border-radius-bottomleft: 4px;
    border-top-left-radius: 4px;
    border-bottom-left-radius: 4px;
}

.aac-main-menu li.last a {
   ...