<section class="not_example">
      <div class="color">アイテム</div>
      <div class="color transparent">透明</div>
      <div class="color">アイテム</div>
      <div class="color transparent">透明</div>
      <div class="color transparent">透明</div>
      <div class="color">アイテム</div>
      <div class="color">アイテム</div>
      <div class="color">アイテム</div>
      <div class="color transparent">透明</div>
      <div class="color">アイテム</div>

    </section>
.not_example {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  padding: 20px;
}
.not_example .color {
  background-color: #f4f4f4;
  border: 1px solid #ccc;
  padding: 20px;
  text-align: center;
  font-size: 1.2em;
  color: #333;
}

.not_example :nth-child(even of :not(.transparent)) {
  background-color: pink;
}

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External JavaScript

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