JSFiddle - React, Tailwind, and code Playground

HTML

<div class="grid">
  <div class="box grid__1">head</div>
  <div class="box grid__item">1</div>
  <div class="box grid__item">2</div>
  <div class="box grid__item">3</div>
  <div class="box grid__item">4</div>
  <div class="box grid__item">5</div>
  <div class="box grid__item">6</div>
</div>

CSS

.grid {
  display: grid;
  background-color: #eee;
  grid-gap: 5px 5px;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-flow: dense;
}
.box {
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 60px;
  font-size: 150%;
}
.grid__1 {
  background-color: #ccc;
  grid-column: 1 / 2;
  padding: 5px;
  font-size: 1rem;
}

.grid__item {
  grid-column: span 1;
  grid-row: span 2;
}