<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>垂直居中:使用flex和align</title>
<style type="text/css">
.parent{
display: flex;
flex-direction: column;
justify-content: center;
background-color: red;
height: 100px;
}
.son{
background-color: #00FFFF;
}
</style>
</head>
<body>
<div class="parent">
<div class="son">
测试垂直居中
</div>
</div>
</body>
</html>
