.row-of-thumbs {
  margin: 0 0 15px;
}

.row-of-thumbs:after {
  content: "."; 
  display: block; 
  height: 0; 
  clear: both; 
  visibility: hidden;
}

/* Hides from IE-mac \*/
* html .row-of-thumbs {height: 1%;}
.row-of-thumbs {display: block;}
/* End hide from IE-mac */

.thumb {
  float: left;
  width: 200px;
  margin: 0 15px;
}

* html .thumb { margin: 0 10px; }

.thumb img {
  border: solid 1px #ddd;
  padding: 1px;
}