JSFiddle - React, Tailwind, and code Playground

HTML

<section class="featured video">
    <h1>VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO (3)</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO (6)</h1>
</section>
<section class="featured video">
    <h1>VIDEO</h1>
</section><section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO (9)</h1>
</section>

CSS

.featured {
  width:31%;
  margin:0 0 20px 0;
  padding:0 3.5% 2em 0;
  float:left;
  background:#ccc;
  display:block;
}
  .featured.module:nth-of-type(4n+n) {
    padding-right:0;
    background:red;
  }
  .featured.video {
    width:100%;
    padding:0 0 2em 0;
  }