.tn-elem.flipcard { perspective: 1000px; }
.tn-elem.flipcard .inner { transform-style: preserve-3d; transition: transform .6s; }
.tn-elem.flipcard .face, .tn-elem.flipcard .back { backface-visibility: hidden; }
.tn-elem.flipcard .back { transform: rotateY(180deg); }
.tn-elem.flipcard:hover .inner,
.tn-elem.flipcard .inner.is-flipped { transform: rotateY(180deg); }