JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="tabs">
        <ul>
            <li><a href="#item1">Item 1</a></li>
            <li class="active"><a href="#item2">Item 2</a></li>
            <li><a href="#item3">Item 3</a></li>
        </ul>
        <div class="tabInner">
            <div id="item1">
                bla1
            </div>
            <div id="item2">
                bla2
            </div>
            <div id="item3">
                bla3
            </div>
        </div>
    </div>
</body>

CSS

.tabs ul {
    list-style: none;
}

.tabs ul li {
    float: left;
    background: #eee;
    border: 1px #aaa solid;
    border-bottom: none;
    margin-right: 10px;
    padding: 5px;
}

.tabs ul li.active {
    margin-bottom: -1px;
    padding-bottom: 6px;
}

.tabInner {
    clear: both;
    border: 1px solid #aaa;
    height: 200px;
    overflow: hidden;
    background: #eee;
}

.tabInner div {
    height: 200px;
    padding: 10px;
    
}