CodePen Embed - xPPJZa

<div class="box">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item"><code>grid-row-end: 4;</code></div>
  <div class="item">5</div>
  <div class="item">6</div>
  <div class="item">7</div>
</div>

.box {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-gap: 2px;
}

.box .item {
  background-color: tomato;
  color: white;
  font-size: 1.4em;
  font-family: monospace;
  padding: 16px;
  text-align: center;
}

.box .item:nth-child(4) {
  grid-row-start: 1;
  grid-row-end: 4;
  background: gold;
  font-size: 1.35em;
  padding-top: 25%;
}

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