<!-- display: flex  -->
<div class="flexBox">
  <div class="boxItem">item 1</div>
</div>

<!-- display: grid  -->
<div class="gridBox">
  <div class="boxItem">item 2</div>
</div>
.flexBox{
  display:flex;
  align-items:center; /* 방향이 row 기준: 세로 중앙 정렬*/
  height:200px;
  background:green;
}

.gridBox{
  display:grid;
  align-items:center; /* 방향이 row 기준: 세로 중앙 정렬*/
  margin-top:30px;
  height:200px;
  background:orange;
}

.boxItem{
  display:inline-block;
  background:blue;
  color:#fff;
}

External CSS

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External JavaScript

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