ul { list-style: none; }

thumbnails { display: block; margin-bottom: 6px; width: 200px}
thumbnails ul li { float: left; margin-left: 12px; margin-bottom: 6px; }

/** clearfix **/
.clearfix:after { content: "."; display: block; clear: both; visibility: hidden; line-height: 0; height: 0; }
.clearfix { display: inline-block; }
 
html[xmlns] .clearfix { display: block; }
* html .clearfix { height: 1%; }