<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
.center {
background-color: #CCC; position:relative;float:left; left:50%;
}
</style></head>
<body>
<div class="center">我们来学习下！</div>
</body>
</html>
2018-03-30
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
.cen{
float:left;
position:relative;
left:50%}
.center {
background-color: #CCC; position:relative; left:-50%; width:400px; text-align:center;
}
.center1 {
background-color: #CCC; position:relative; left:50%; float:left; width:400px; text-align:center;
}
</style></head>
<body>
<!--<div class="cen">
<div class="center">我们来学习下！</div>
</div>-->
<div class="center1">我们来学习下！</div>
</body>
</html>
不用父层，是把整个容器放在了页面51%处，我不知道我说的是否是对的，您试一下这一段代码看看，一个有父层一个没有
举报
