/* entire container, keeps perspective */
.flip-container {
  -webkit-perspective: 1000px;
  perspective: 1000px;
}

/* flip the pane when clicked */
.flip-container.clicked .back {
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  -ms-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
  transform: rotateY(180deg);
}
.flip-container.clicked .front {
  -webkit-transform: rotateY(0deg);
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -o-transform: rotateY(0deg);
  transform: rotateY(0deg);
}

/* how a card looks after it has been matched*/
.revealed {
  opacity:.5;
  -webkit-transition:opacity 0.4s linear;
  -moz-transition:opacity 0.4s linear;
  -ms-transition:opacity 0.4s linear;
  -o-transition:opacity 0.4s linear;
  transition:opacity 0.4s linear;
}

/* flip speed goes here */
.flipper {
  width:90%;
  height:90%;
  margin:0% auto;
  -webkit-transition: 0.5s;
  -moz-transition: 0.5s;
  -ms-transition: 0.5s;
  -o-transition: 0.5s;
  transition: 0.5s;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  transform-style: preserve-3d;
  position: absolute;
  top:5%;
  bottom:5%;
  left:5%;
  right: 5%; 
}

/* hide back of pane during swap */
.front, .back {
  width:100%;
  height:100%;
  display: block;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition: 0.5s;
  -moz-transition: 0.5s;
  -ms-transition: 0.5s;
  -o-transition: 0.5s;
  transition: 0.5s;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  transform-style: preserve-3d;
  position: absolute;
  top: 0;
  left: 0;
}

/* back pane, placed above front */
.back {
  /* for firefox 31 */
  -webkit-transform: rotateY(0deg);
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -o-transform: rotateY(0deg);
  transform: rotateY(0deg);
  background-color: #fce43a; /*starlight yellow*/
  border-radius: 5%;
  background-position:50% 50%;
  background-repeat: no-repeat;
  background-size: contain;

}

/* front, initially hidden pane */
.front {
  -webkit-transform: rotateY(-180deg);
  -moz-transform: rotateY(-180deg);
  -ms-transform: rotateY(-180deg);
  -o-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
  background-color: #fff; /*cards should be white if blank*/
  border-radius: 5%;
  background-position:50% 50%;
  background-repeat: no-repeat;
  background-size: cover;
}

#blank-index{
    position: relative;
    background-color: transparent;
}