<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " 标签: css边框
居中是写css最常用到的技能。但css中居中却不如table来的简单，并且实现跨浏览器同效果很麻烦。这里总结出各个元素的水平居中代码（IE7、Firefox2、Opera9.5下通过）：最好先有这句声...
 100% 0 repeat-y;<br /> }<br /> .bi {<br /> padding:0 0 0 1px;<br /> background:#000 url(/jscss/demoimg/200909/borders.gif) 0 0 repeat-y;<br /> }<br /> .bb {<br /> height:30px;<br /> margin:0 -7px 0 -1px;<br /> background:url(/jscss/demoimg/200909/box.gif) 100% 100% no-repeat;<br /> }<br /> .bb div {<br /> width:18px;<br /> height:30px;<br /> background:url(/jscss/demoimg/200909/box.gif) 0 100% no-repeat;<br /> }<br /> .portlet h2 {<br /> height:20px;<br /> padding:0 0 0 10px;<br /> background-color:#666;<br /> background-image:url(/jscss/demoimg/200909/topright.gif);<br /> background-position:right top;<br /> background-repeat:no-repeat;<br /> color:#592C16;<br /> line-height:20px;<br /> }<br /> <br /> .portletcontent p {<br /> padding:8px 10px 8px 10px;<br /> background:#fff;<br /> }<br /> </style><br /> <br /> </head><br /><body></p><p><h3>Custom box with no width restrictions. Height restriction is based on the amount of content.</h3><br /><div class="portlet"><!-- Start Portlet --><br /><h2 style="background-color:#E5E5D8;">text</h2><br /><div class="portletcontent"><div class="bi"><br /><!-- Visual Content for Portlet below --><br /><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.<br />Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.<br /></p><br /><div class="bb"><div></div></div><br /></div><br /></div><!-- End Portlet Content--><br /></div><!-- End Portlet --><br /><h3>Custom box set to fill 50% (width) of the viewable window regardless the size of the browser window.</h3><br /><div class="portlet" style="width:50% "><!-- Start Portlet --><br /><h2 style="background-color:#E5E5D8;">text</h2><br /><div class="portletcontent"><div class="bi"><br /><!-- Visual Content for Portlet below --><br /><p><br />Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.<br />Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis.<br /></p><br /><div class="bb"><div></div></div><br /></div><br /></div><!-- End Portlet Content--><br /></div><!-- End Portlet --></p><p><h3>Custom box set to have a fixed width of 300 pixels.</h3><br /><div class="portlet" style="width:300px "><!-- Start Portlet --><br /><h2 style="background-color:#E5E5D8;">text</h2><br /><div class="portletcontent"><div class="bi"><br /><!-- Visual Content for Portlet below --><br /><p><br />Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.<br />Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis.<br /></p><br /><div class="bb"><div></div></div><br /></div><br /></div><!-- End Portlet Content--><br /></div><!-- End Portlet --><br /></body></html></p><br/> </div>
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