JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a">
<div class="b"> some text </div>
<div class="b"> some text </div>
<div class="b c"> some text </div>
</div>

CSS

.a{
    width:300px;
    height:400px;   
    overflow:scroll;
}

.b{
    margin:5px;
    width:500px;
    height:100px;
    background:red;
}

.c{
   position:fixed;    
}