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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>元素单位px,em.rem的介绍</title>
<style type="text/css">
.px{/*px,相对于屏幕*//*后面有line-height(行高),此处可选*/
width: 100px;
height:100px;
background-color:red;
text-align: center;
margin: 1px auto;
}
.em{ /*em,相对于当前元素或父元素文本大小*/
font-size:16px;
width: 6.25em;
height:6.25em;
background-color:#FFD534;
text-align: center;
margin: 1px auto;
}
.rem{ /*em,相对于根html元素文本大小*/
width:6.25rem;
height:6.25rem;
background-color:#2A98FF;
text-align: center;
margin: 1px auto;
}
</style>
</head>
<body>
<div class="px">这个是px</div>
<div class="em">这个是em</div>
<div class="rem">这个是rem</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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