.clearfix, #contentContainer section ul {
  *zoom: 1;
}
.clearfix:after, #contentContainer section ul:after {
  content: "\0020";
  display: block;
  height: 0;
  clear: both;
  overflow: hidden;
  visibility: hidden;
}

#contentContainer section {
  width: 820px;
  margin: 30px auto 0;
}
#contentContainer section ul {
  margin-right: -20px;
}
#contentContainer section ul li {
  float: left;
  width: 260px;
  margin: 0 20px 20px 0;
}
#contentContainer section ul li img {
  display: block;
  margin-bottom: 10px;
}
#contentContainer section ul li p {
  font-size: 120%;
  line-height: 1.6;
}