The following code, the style of the class contains so much, don't know what is the use, could you tell me where can I check the details, and there are various styles of rendering, thank you,
<body>
"wrapper wrapper - content" & gt;
"panel panel - the primary" & gt;
"panel - the heading" & gt;
"panel - body" & gt;
"accordion - group" & gt;
Query & lt;/a>
Reset & lt;/a>
"accordion - body collapse" & gt;
& gt;
"form form - horizontal well clearfix" & gt;
"col - xs - 12 col - sm - 6 col - md - 4" & gt;
Query & lt;/a>
Reset & lt;/a>