<section class="example">
      <div class="color">赤</div>
      <div class="color">青</div>
      <div class="color">黄</div>
      <div class="color">緑</div>
      <div class="color">赤</div>
      <div class="color">青</div>
      <div class="color">黄</div>
      <div class="color">緑</div>
      <div class="color">赤</div>
      <div class="color">青</div>
    </section>
.example {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  padding: 20px;

}

  .color {
    background-color: #f4f4f4;
    border: 1px solid #ccc;
    padding: 20px;
    text-align: center;
    font-size: 1.2em;
    color: #333;
  }

.color:nth-child(1) {
  background-color: red;
  color: #fff;
}

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External JavaScript

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