JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout/2.3.0/knockout-min.js"></script>
<script type="text/javascript">
    var viewModel = {};
    
    $(function () {
        viewModel.loseFocus = function () {
          $("#textbox").blur();
          $("#menu").toggle();
        };
        ko.applyBindings(viewModel);
    });
</script>

<div id="menuBar">
    <div id="showMenu" data-bind="event: { click: viewModel.loseFocus }">☰</span>
    <div id="menu">
        <ul>
            <li>Menu Option 1</li>
            <li>Menu Option 2</li>
            <li>Menu Option 3</li>
        </ul>
    </div>
</div>
<div id="content">
    <label for="textbox">Text:</label>
    <input id="textbox" type=text></input>
</div>

CSS

body {
    font-family:Verdana;
}

#menuBar {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    background: #ddd;
    z-index: 2;
    overflow: visible;
}

#showMenu {
    padding: 10px;
    font-size:1.5em;   
}

#menu {
    background: #ccc;  
    font-size: .8em;
    position: absolute;
    display: none; 
    z-index: 3;
}

ul {
    list-style-type: none;
    margin: 0;
}

li {    
    margin-left:-40px;
    margin-top:-1px;
    padding: 5px;
    border: 1px solid #aaa;
}

#content {
    position: absolute;
    font-size: 1.2em;
    top: 60px;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1;
    padding: 5px;
}

input {    
    font-size: 1.2em;
}