<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>fixed</title>
<style type="text/css">
.div1{
position: fixed;
left: 100%;
top: 50%;
margin-left: -200px;/*向左移动一个DIV的宽度就可以显示了的*/
margin-top: -100px;
200px;
height: 200px;
border: 1px solid blue;
background: pink;
z-index: 999;
}
.div2{
margin: 0 auto;
500px;
height: 1000px;
border: 1px solid blue;
background: silver;
}
</style>
</head>
<body>
<div class="div1">
11111111111111111111
</div>
<div class="div2"></div>
</body>
</html>