<section class="example_three">
      <div class="number">1</div>
      <div class="number">2</div>
      <div class="number three">3</div>
      <div class="number">4</div>
      <div class="number">5</div>
      <div class="number three">6</div>
      <div class="number">7</div>
      <div class="number">8</div>
      <div class="number three">9</div>
      <div class="number">10</div>
    </section>
.example_three {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  padding: 20px;
}
.example_three .number {
  background-color: #f4f4f4;
  border: 1px solid #ccc;
  padding: 20px;
  text-align: center;
  font-size: 1.2em;
  color: #333;
}


.example_three .number:nth-child(3n) {
  background-color: skyblue;
}

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