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Grid -- сетка с nth-child

HTML

<div class="block">

  <div class="item"></div>
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  <div class="item"></div>
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</div>

CSS

@import url('https://fonts.googleapis.com/css2?family=Neucha&display=swap');


* {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Neucha', cursive;
}
.block {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 50px;
  grid-gap: 15px;
  max-width: 500px;
  margin: 0 auto;
}
.item {
  background: #8E9BFF;
}

.item:nth-child(10n-9), .item:nth-child(10n-2) {
  grid-column: span 2;
  grid-row: span 2;
}