组合样式，CSS继承
.content { padding:0 0 0 5px; line-height: 30px; height: 30px; border: 1px solid #a6bee7; vertical-align: middle; }
/*不加空格，则表示class="content small"且small只有跟在content后面有效，否则无效
有效，如<div class="content small">则div的宽度是29.如果.content .small有空格，则表示，content的子元素的样式是small，子元素继承content的样式如<div class="content"><div class="small">*/
.content.small { width: 29%; }
.content.medium { width: 42.5%; }
.content.large { width: 92%; }
设置label标签样式，去掉每行都有边框
.disabled-label { width:90%; color:#cccccc; border: 1px solid #cccccc; display: inline-block; }
<asp:Label ID="Reason" runat="server" CssClass="disabled-label"></asp:Label>
IE8下 Select文字垂直居中的办法
.select { padding: 4px 0; height: 30px; line-height: 26px; vertical-align: middle; }
让DIV内的li横向居中显示
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <style> .utop { } .utop ul { display: table; margin-left: auto; margin-right: auto; } .utop ul li { float: left; text-decoration: none; border-style: none; list-style-type: none; padding:4px; } </style> </head> <body> <div class="utop"> <ul><li>sd</li><li>sd</li></ul> </div> </body> </html>