.imagelistexpander-items {
  font-size: 0;
}
.imagelistexpander-item {
  display: inline-block;
  vertical-align: top;
  -webkit-transition: height 500ms ease;
  -o-transition: height 500ms ease;
  transition: height 500ms ease;
}
.imagelistexpander-expander {
  position: absolute;
  left: 0;
  right: 0;
  overflow: hidden;
  max-height: 0;
  -webkit-transition: max-height 500ms ease;
  -o-transition: max-height 500ms ease;
  transition: max-height 500ms ease;
}
.imagelistexpander-contents {
  position: relative;
}
.imagelistexpander-contents:after {
  display: block;
  position: absolute;
  bottom: 0px;
  left: 50%;
  margin-left: -30px;
  width: 0;
  height: 0;
  content: '';
  border-left: 30px solid transparent;
  border-right: 30px solid transparent;
  border-bottom-style: solid;
  border-bottom-width: 0px;
  -webkit-transition: border-bottom-width 500ms ease;
  -o-transition: border-bottom-width 500ms ease;
  transition: border-bottom-width 500ms ease;
}
.imagelistexpander-item.active .imagelistexpander-contents:after {
  border-bottom-width: 30px;
}