本文实例讲述了CSS实现body背景层高于块元素的方法，分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
</head>
<style>
html, body{
width: 100%;
max-width: 640px;
height: 100%;
overflow-x: hidden;
margin: 0 auto;
background-color: #000;
font-family: 微软雅黑, 华文细黑, 黑体;
}
body{
background-image: url('img/person1.png');
background-repeat: no-repeat;
background-position: bottom;
background-color: transparent;
background-size: 100%;
}
.box{
width: 100%;
height: 50%;
background-color: green;
z-index: -1;
position: absolute;
}
</style>
<body>
<div class="box"></div>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
</head>
<style>
html, body{
width: 100%;
max-width: 640px;
height: 100%;
overflow-x: hidden;
margin: 0 auto;
background-color: #000;
font-family: 微软雅黑, 华文细黑, 黑体;
}
body{
background-image: url('img/person1.png');
background-repeat: no-repeat;
background-position: bottom;
background-color: transparent;
background-size: 100%;
}
.box{
width: 100%;
height: 50%;
background-color: green;
z-index: -1;
position: absolute;
}
</style>
<body>
<div class="box"></div>
</body>
</html>
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