html - 没有负边距的绝对中心 div

Question

我已经尝试了大约 6 种不同的方法，但都无法使它起作用。

我试图在使用 position:absolute;

时将“div.content”在页面上水平居中

此方法适用于所有浏览器，但如果缩小页面大小，底部会出现滚动条:

http://jsfiddle.net/AuqXY/16/

HTML:

<div class="wrapper">
    <div class="header"></div>
    <div class="footer"></div>
    <div class="content">
        <div class="content2">CENTER THIS DIV</div>
    </div>
</div>

CSS:

div.header {
    background:url('http://i.istockimg.com/file_thumbview_approve/11670843/2/stock-illustration-11670843-seamless-wallpaper-background-tile.jpg') top center repeat-x;
    height:150px;        
}

div.footer {
    background:url('http://www.featurepics.com/FI/Thumb300/20081029/Blue-Tile-Background-947601.jpg') top left repeat-x;
    height:150px;        
}

div.content {
    position:absolute;
    top:20px;
    left:50%;
    height:250px;
    width:300px;        
}

div.content2 {
    position:relative;
    left:-50%;
    background:white;  
    height:250px;
}

Answer 1

我建议使用这样的负边距:http://jsfiddle.net/joshnh/HFwMT/

调整后的代码如下:

HTML:

<div class="header"></div>
<div class="content">
   <div class="content2">HERE</div>
</div>
<div class="footer"></div>​

CSS:

.header {
    background: url('http://i.istockimg.com/file_thumbview_approve/11670843/2/stock-illustration-11670843-seamless-wallpaper-background-tile.jpg') top center repeat-x;
    height: 150px;        
}
.footer {
    background: url('http://www.featurepics.com/FI/Thumb300/20081029/Blue-Tile-Background-947601.jpg') top left repeat-x;
    height: 150px;        
}
.content2 {
    background: #fff;  
    height: 250px;
    left: 50%;
    margin-left: -150px; /* Half of the width */
    margin-top: -130px;   
    position: absolute;
    width: 300px;
}​