JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
  <h1>Header</h1>
  <div id="center">
    <div style="height:1000px">high content</div>
  </div>
  </code>
  <div id="footer">Footer</div>
</div>

CSS

#wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width:100%;
    height: 100%;
    background: #aaf;
}

#center {
    position: absolute;
    top: 10%;
    left: 10%;
    width:80%;
    height: 80%;
    background: white;
    overflow: auto;
}