.flashcard{width:375px;height:550px}.flashcard-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;top:0;left:0}.flashcard-back{transform:rotateY(180deg)}