JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container-main">
  <div class="nav-bar">top nav bar</div>
  <div class="container-dd">
    <div class="dd-fill">
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
      <p>list item</p>
    </div>
    <div class="dd-bot">sticky footer</div>
  </div>
</div>

CSS

html, body {
  height: 100%;
}

.container-main {
  display: flex;
  height: 100%;
  flex-flow: column;
}

.nav-bar {
  display: flex;
  height: 36px;
  background-color: grey;
}

.container-dd {
  height: 100%;
  display: flex;
  flex-flow: column;
}

.dd-fill {
  display: flex;
  flex-flow: column;
  flex: 1 1 auto;
  background-color: green;
  overflow: hidden;
}

.dd-bot {
  display: flex;
  height: 100px;
}