JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<div class="d-flex overflow-hidden" style="max-width:200px; max-height:200px;">
  
  <div class="d-flex flex-column flex-fill bg-warning overflow-hidden">   
    <div class="d-flex flex-fill bg-success"></div>
    <div class="d-flex flex-shrink-0 overflow-auto"> 
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
      <div class="p-2 border border-light text-light" style="width: 40px; height:40px;">abc</div>
    </div>  
  </div>  
  
  <div class="d-flex flex-column flex-shrink-0 bg-dark custom-scroll">
    <div class="p-2 border border-light text-light" style="width: 40px;">abc</div>
    <div class="p-2 border border-light text-light" style="width: 40px;">abc</div>
    <div class="p-2 border border-light text-light" style="width: 40px;">abc</div>
    <div class="p-2 border border-light text-light" style="width: 40px;">abc</div>
    <div class="p-2 border border-light text-light"...

CSS

.custom-scroll {
  overflow-y: scroll;
}