<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.top{
position: fixed;
top: 0px;
height: 44px;
width: 100%;
text-align: center;
}
.box {
width: 1000px;
margin: 44px auto;
}
.left,
.right {
position: fixed;
/*当使用绝对够定位时，margin-top和top 同时使用时，选择最大的起作用*/
margin-top: 200px;
top: 1px;
width: 120px;
}
.left {
left: 0px;
}
.right {
right: 0px;
}
</style>
</head>
<body>
<div class="top">
<img src="images/top.png" alt="">
</div>
<div class="box">
<img src="images/box.png" alt="">
</div>
<img src="images/ad-l.png" alt="" class="left">
<img src="images/ad-r.png" alt="" class="right">
</body>
</html>
所用素材：
