JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

<div id="container">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

CSS

#container {
  padding: 10px;
  width: calc((100px + (10px * 2)) * 4);
  /* item width + padding on either side times number of items */
  display: flex;
  flex-wrap: wrap;
  background: blue;
  margin: 10px;
}

#container div {
  width: 100px;
  height: 100px;
  flex-grow: 1;
  background: red;
  margin: 10px;
}