4-3练习问题

来源：4-3 编程练习

xxxxxbilibli

2018-03-14 19:41:29

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
<title></title>
<style>
*{margin:0;
    padding:0;
}
    .bg{
        width:100%;
        height:4033px;
        background:url(http://climg.mukewang.com/59c9f7ce0001839219034033.png) no-repeat center;
        /*position:relative;*/
    }
    .one{
        width:220px;
        height:380px;
        background:url(http://climg.mukewang.com/5a3383c70001f1b702240364.png) no-repeat;
        position:fixed;
        right:0;
        top:50%;
        margin-top:-190px;
    }
    .two{
        width:220px;
        height:380px;
        background:url(http://climg.mukewang.com/5a3383d00001a3dd02240364.png) no-repeat;
        position:fixed;
        left:0;
        top:50%;
        margin-top:-190px;
    }
</style>
</head>
<body>
<div class="bg">
<div class="one"></div>
<div class="two"></div>
</div>
</body>
</html>

注释那行代码，通常会不会用到，还是说只相对于网页来定位。

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