JSFiddle - React, Tailwind, and code Playground

HTML

<div style="
    padding-left: 5px;
    padding-right: 5px;
    margin-left: 50%;
    transform: translateX(-50%);
    display: inline-block;
    max-width: 300px;
    width: 300px;
    background-color: red">
something

  <div style="width: 100px; height: 100px; background-color: blue; position: fixed; left: 0">
  Gallery
  </div>
</div>

CSS

body {
  margin: 0;
  padding: 0;
}