#content_main {
  width: 960px;
}
#content h2 {
  margin-top: 30px;
  font-weight: bold;
  font-size: 18px;
  margin-bottom: 10px;
}
#content_main h3 {
  font-size: 12px;
  margin-bottom: 10px;
}
#content_main .extra_column p {
  margin-bottom: 10px;
}


#content_main .main_column {
  float: left;
  width: 400px;
  margin-right: 20px;
}
#content_main .sub_column {
  float: left;
  width: 260px;
  margin-right: 20px;
}
#content_main .extra_column {
  float: left;
  width: 240px;
}