JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id='cssmenu' onclick=HeightUp();>
        <input type="submit" name="change" value="First Button" id="figs" />
        <input type="submit" name="change" value="Second Button" id="tr" />
        <input type="submit" name="change" value="Third Button" id="fbp" />
    </div>
    <div id='figmenu' class="figmenu">
        <input type="submit" name="change" value="4th Button" id="b4" />
        <input type="submit" name="change" value="5th Button" id="b5" />
        <input type="submit" name="change" value="6th Button" id="b6" />
    </div>
</body>

CSS

.figmenu {
        height: 50px;
        background-color: red;
    }

JavaScript

function HeightUp() {
        var fm = document.getElementById('figmenu');
        fm.style.height = '500px';
    }