.flashcard-container{perspective:1000px;width:100%;height:20rem}.flashcard{width:100%;height:100%;position:relative;transition:transform .6s;transform-style:preserve-3d;cursor:pointer}.flashcard.is-flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden}.flashcard-back{transform:rotateY(180deg)}