JSFiddle - React, Tailwind, and code Playground

HTML

<div id='container'>
    <div id='menu'>
            menu
    </div>    
    
    <div id='content'>
        content
    </div>    
</div>

CSS

#container{
    width:100%;
    border: 1px solid red;
    overflow:hidden;
}

#menu{
    width:16%;
    border: 1px solid blue;
    display:inline-block;
}

#content{
    width:100%;
    border: 1px solid green;
    display:inline-block;
}