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<head>
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<link rel="stylesheet" href="./css/box.css">
<title>垂直居中-宽高已知-设置行高与高度相等</title>
<style>
.outer {
height: 350px;
background-color: purple;
margin: 10px;
text-align: center;
}
.inner {
height: 300px;
line-height: 300px;
background-color: skyblue;
border: 1px solid seagreen;
margin: 0 auto;
padding: 5px;
}
</style>
</head>
<body>
<!-- 信息框：解说 -->
<div class="default-info ">
<div class="default-info-item default-info-header">
垂直居中-宽高已知-设置行高与高度相等
</div>
<div class="default-info-item default-info-body">
<p>垂直居中：设置行高与高度相等</p>
<p>只适用于单行文本</p>
</div>
<div class="default-info-item default-info-footer">
注意：行高要去掉 "边框与内边距", 如果存在的话
</div>
</div>
<div class="outer">
<span class="inner">
垂直与水平居中
</span>
</div>
</body>
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