CodePen Embed - VwNrYeP

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

.item {
  height: 100px;
  background: red;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: calc(300px * 3 + 30px * 2);
  margin: auto;
}

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