JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
    <div id="sidebar">
    test tes test
  </div>
</div>

CSS

#container {
  display:flex;
}
#sidebar {
  border:1px solid red;
  overflow:hidden;
}