JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
  <h1>Header 1</h1>
</div>

<div class="item">
  <h1>Item1</h1>
</div>

<div class="item">
  <h1>Item2</h1>
</div>

<div class="header">
  <h1>Header 2</h1>
</div>

<div class="item">
  <h1>Item1</h1>
</div>

<div class="item">
  <h1>Item2</h1>
</div>

CSS

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

h1 {
  text-align: center;
  color: #000;
  font: bold 20vw Helvetica, Arial, sans-serif;
}

.header {
  position: sticky;
  top: 0px;
}
.item {
  height: 100vh;
  width: 100%;
  background: #00f;
}