JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<div class="header">header</div>
<div class="content">content</div>
<div class="footer">bottom</div>
</div>

CSS

.container {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 400px;
}

.header {
  flex-grow: 0;
  background-color: red;
}
.content {
  flex-grow: 1;
  background-color: green;
}
.footer {
  flex-grow: 0;
  background-color: blue;
}