<div class="container">
  <div class="item item--1">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
  <div class="item">7</div>
  <div class="item">8</div>
</div>
/* -------- Skip this base code -------- */
* { box-sizing: border-box; } .container { display: grid; gap: 1px; padding: 1px; border: 16px solid silver; color: white; } .item { padding: 8px; background: coral; } .item--1 { background: royalblue; }

.container {
  grid: 
    [A] 
    '. . . . .'
    [B] 
    '. . . . .'
    [C] 
    '. . . . .' 
    [D]
    /
    [A] 1fr [B] 1fr [A] 1fr [B] 1fr [A] 1fr [B];
}
.item--1 {
  grid-area: A / span 2 A / span C / -1 A;
}

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