JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="card">
    <div class="header">Header 1</div>
  </div>
  <div class="card" style="background-color:black;">
    <div class="header">Header 2</div>
  </div>
</div>

CSS

.container {
  background-color: red;
  height: 120vh;
  display: flex;
  /* overflow-x: auto; */
  position: relative;
}

.card {
  background-color: blue;
  min-width: 200px;
  height: 300px;
  margin-right: 10px;
  position: relative;
}

.header {
  background-color: green;
  min-width: 200px;
  height: 50px;
  position: sticky;
  top: 0;
}