.collapse-trigger {
  position: relative;
}
.collapse-trigger .icon {
  margin-top: 3px;
}
.collapse-trigger .icon.left {
  float: left;
  margin-right: 4px;
}
.collapse-trigger .icon.right {
  float: right;
  margin-left: 4px;
}
.collapse-area .icon-collapse-arrow {
  transition: 0.3s all ease-in;
  -ms-transform: rotate(0deg);
  -webkit-transform: rotate(0deg);
  transform: rotate(0deg);
}
.collapse-area.visible .icon-collapse-arrow {
  transition: 0.3s all ease-in;
  -ms-transform: rotate(180deg);
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}