.vertical-align {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
}

.smooth-transform(@properties) when (default()) {
  -webkit-transition-property: @properties;
  transition-property: @properties;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
  -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
  transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}