JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class=top>Top</div>
  <div class=middle>
    Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>Middle<br/>
  </div>
  <div class=bottom>
    Bottom
  </div>
</div>

CSS

/** Removing any of these 3 selectors will prevent Middle from having a scrollbar */
body, html, .container {
  height: 100%;
}

.middle {
  overflow: auto;
  min-height: 0;
}

/* --- */

body, html {
  padding: 0;
  margin: 0;
}

.container {
  display: grid;
  grid-template-rows: max-content 1fr max-content;
}

.top {
  background: lightgreen;
}

.middle {
  background: yellow;
}

.bottom {
  background: lightblue;
}