.switched-tabs.current {
  position: relative;
  z-index: 1;
  -webkit-transition: 1s;
  -o-transition: 1s;
  -moz-transition: 1s;
  transition: 1s;
  opacity: 1;
}
.switched-tabs {
  position: absolute;
  z-index: -1;
  opacity: 0;
  top: 0;
}