JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="header">header</div>
    <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text some text</p>
     <p>some text...

CSS

.container {
 background: #eee;
 width: 75%;
}

.header {
 position: fixed;
 background: #ccc;
}