<div class="layout">
  <div class="child">a</div>
  <div class="child">a</div>
  <div class="child">a</div>
</div>
.layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  // same as:
  // grid-template-columns: repeat(3, 1fr);
  grid-gap: 8px;
}
.child {
  min-height: 100px;
  background: orange;
  line-height: 100px;
  text-align: center;
}

External CSS

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External JavaScript

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