.reference {
  float: left;
  width: 540px;
  padding-bottom: 16px;
  border-bottom: solid 1px #CCCCCC;
  margin-bottom: 16px;
}
.reference:last-of-type {
  border-bottom: 0px !important;
  margin-bottom: 0px !important;
}
.reference_number,
.reference_details {
  font-size: 14px;
  line-height: 18px;
}
.reference_number {
  float: left;
  width: 40px;
}
.reference_details {
  float: left;
  width: 500px;
}