JSFiddle - React, Tailwind, and code Playground

HTML

<div class="paf">
  <div class="elem">
  </div>
  <div class="elem">
  </div>
  <div class="elem">
  </div>
  <div class="elem">
  </div>
  <div class="elem">
  </div>
</div>

CSS

.paf {
  display: flex;
  width: 300px;
  height: 300px;
  flex-wrap: wrap;
  background-color: blue;
  align-content: stretch;
}

.elem {
  display: flex;
  min-width: 60px;
  flex-grow: 1;
  background-color: green;
}

.paf :nth-child(2n + 1) {
  background-color: red;
}