<div class="grid">
  <div class="aspect-ratio-box rowspan-2">
    11
  </div>
  <div class="aspect-ratio-box">
    22
  </div>
  <div class="aspect-ratio-box">
    33
  </div>
</div>
html, body{
  padding: 0;
  margin: 0;
}

.grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  grid-template-rows: 1fr;
  grid-column-gap: 20px;
  grid-row-gap: 20px;
  padding: 20px;
}

.rowspan-2 {
  grid-row: 1 / 3;
}

.aspect-ratio-box {
  background: gray;
}
.aspect-ratio-box::before {
  content: "";
  width: 1px;
  margin-left: -1px;
  float: left;
  height: 0;
  padding-top: 100%;
}
.aspect-ratio-box::after {
  content: "";
  display: table;
  clear: both;
}

External CSS

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External JavaScript

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