Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<div id='container' style='display: flex; border: 1px solid green; flex-direction=row'>
  <div style='position: relative; display: block; border: 1px solid red'>
    <div style='transform-origin: bottom left; transform: translateY(-100%) rotate(90deg); border: 2px solid black;'>
      <div style='border: 1px solid green; display: inline-block'>menu 1</div>
      <div style='border: 1px solid green; display: inline-block'>menu 2</div>
    </div>
  </div>
  <div id='rightbox' style='position: relative; display: flex; flex: 1 1 auto; border: 1px solid orange';>
    xx
  </div>
</div>

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