<h3>flex垂直居中</h3>
<div class="container">
  <div class="center">我想居中</div>
</div>
.container {
  width: 300px;
  height: 300px;
  background-color: #e1e1e1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.center {
  width: 200px;
  height: 200px;
  background-color: pink;
}

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