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设置页面高度为浏览器可视窗口大小
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>title</title>
<style>
html,body {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
.demo {
background-color: #cccccc;
margin: 0 auto;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="demo"></div>
</body>
</html>