JSFiddle - React, Tailwind, and code Playground

HTML

<div id='main'>
    <div id='menu'>
        Menu Items Here
    </div>
    <div id='cont'>
        Content Here
        <div id='footer'>Some Footer</div>
    </div>
</div>

CSS

html, body {
   height: 100%;
   width : 100%;
   margin: 0;
   padding: 0;
}

#main{
    overflow : auto;
    background-color: yellow;
    min-height : 100%;
    position: relative;
}

#menu {
    background-color: red;
    float : left;
    width : 300px;
}

#cont {
    margin-left : 300px;
    background-color: orange;
    min-height : 100%;
    position: absolute;
    right: 0;
}