JSFiddle - React, Tailwind, and code Playground

HTML

<div id="navcont">
        <nav>
        <ul id="navmenu">
            <li class="first"><a href="#1">1</a></li>
            <li><a href="#2">2</a></li>
            <li><a href="#3">3 </a></li>
            <li><a href="#4">4</a></li>
            <li style="margin-right:0px; width: 172px;"><a href="#5">5</a></li>
          </ul>
      </nav>
      </div>

CSS

div#navcont {
    width:960px;
    height:95px;
    padding: 30px;

    
}
ul#navmenu {
    margin:0 auto 0 auto;
    position:relative;
     
}
ul#navmenu li {
    float: left;
    background: #ccc;
    margin-right: 5px;
    width: 171px;
    height: 95px;
    list-style:none;
    -moz-transform: skew(-15deg);
    -webkit-transform: skew(-15deg);
    transform: skew(-15deg);
}
ul#navmenu li > a {
    text-decoration: none;
    display: block;
    position: relative;
    height: 95px;
    padding: 0 20px;
    color: #444;
    -moz-transform: skew(15deg);
    -webkit-transform: skew(15deg);
    transform: skew(15deg);
   
}

ul#navmenu li:first-child {
    background: #aaa;
}

ul#navmenu li:last-child{
    background: #ddd;