JSFiddle - React, Tailwind, and code Playground

HTML

<div style="height:300px;" class="bar1"></div>
<div style="height:200px;" class="bar2"></div>

CSS

.bar1{
    width:40px;
    background-color:red;
    position: absolute;
}
.bar2{
    width:40px;
    background-color:green;
    position: fixed;
}