JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="tabrow">
        <li><a href="#">Lorem</a></li>
        <li><a href="#">Ipsum</a></li>
        <li class="selected"><a href="#">Sit amet</a></li>
        <li><a href="#">Consectetur adipisicing</a></li>
</ul>

CSS

.tabrow {
            text-align: center;
            list-style: none;
            margin: 0 20px;
            padding: 0;
            line-height: 24px;
            height: 26px;
            overflow: hidden;
            font-size: 12px;
            font-family: verdana;
            position: relative;
        }
        .tabrow li {
            border: 1px solid #AAA;
            background: #D1D1D1;
            background: -o-linear-gradient(top, #ECECEC 50%, #D1D1D1 100%);
            background: -ms-linear-gradient(top, #ECECEC 50%, #D1D1D1 100%);
            background: -moz-linear-gradient(top, #ECECEC 50%, #D1D1D1 100%);
            background: -webkit-linear-gradient(top, #ECECEC 50%, #D1D1D1 100%);
            background: linear-gradient(top, #ECECEC 50%, #D1D1D1 100%);
            display: inline-block;
            position: relative;
            z-index: 0;
            border-top-left-radius: 6px;
            border-top-right-radius: 6px;
            box-shadow: 0 3px 3px rgba(0, 0, 0, 0.4), inset 0 1px 0 #FFF;
            text-shadow: 0 1px #FFF;
            margin: 0 -10px;
            padding: 0 20px;
        }
        .tabrow a {
              color: #555;
              text-decoration: none;
        }
        .tabrow li.selected {
            background: #FFF;
            color: #333;
            z-index: 2;
            border-bottom-color: #FFF;
        }
        .tabrow:before {
            position: absolute;
            content: " ";
            width: 100%;
            bottom: 0;
            left: 0;
            border-bottom: 1px solid #AAA;
            z-index: 1;
        }
        .tabrow li:before,
        .tabrow li:after {
            border: 1px solid #AAA;
            position: absolute;
            bottom: -1px;
            width: 5px;
            height: 5px;
            content: " ";
        }
        .tabrow li:before {
            left: -6px;
            border-bottom-right-radius: 6px;
            border-width: 0 1px 1px 0;
   ...

JavaScript

$("li").click(function(e) {
              e.preventDefault();
              $("li").removeClass("selected");
              $(this).addClass("selected");
            });