如何使用can只显示偶数值的网格线？

<div class="grid-container">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
  <div class="grid-item">7</div>
  <div class="grid-item">8</div>
</div>

.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 10px;
}

.grid-item {
  padding: 10px;
  text-align: center;
}

.grid-item:nth-child(2n) {
  border: 1px solid black;
}