JSFiddle - React, Tailwind, and code Playground

HTML

<div id class="content">
    content<br>
    content<br>
    content<br>
    content<br>
    content<br>
 <div class="menu">
    menu<br>
    menu<br>
    menu<br>
    menu<br>
    menu<br>
 </div>
</div>

CSS

.content{
position:relative;
min-height:200px;
background:red;
padding-left:150px;
}

.menu{
background:green;
top:0;
left:0;
bottom:0;
width:150px;
position:absolute;
    }