.flip-clock{text-align:center;perspective:400px;margin:20px auto}.flip-clock *,.flip-clock :before,.flip-clock :after{box-sizing:border-box}.flip-clock__piece{margin:0 2px;display:inline-block}.flip-clock__slot{font-size:.8rem;line-height:1.5;display:block}.card{padding-bottom:.72em;font-size:2.5vw;line-height:.95;display:block;position:relative}@media (max-width:600px){.card{font-size:10vw}}.card__top,.card__bottom,.card__back:before,.card__back:after{color:#ccc;backface-visibility:hidden;height:.72em;transform-style:preserve-3d;background:#222;border-radius:.15em .15em 0 0;width:1.8em;padding:.25em;display:block;transform:translateZ(0)}.card__bottom{color:#fff;pointer-events:none;background:#393939;border-top:1px solid #000;border-radius:0 0 .15em .15em;position:absolute;top:50%;left:0;overflow:hidden}.card__bottom:after{margin-top:-.72em;display:block}.card__back:before,.card__bottom:after{content:attr(data-value)}.card__back{pointer-events:none;height:100%;position:absolute;top:0;left:0%}.card__back:before{z-index:-1;position:relative;overflow:hidden}.flip .card__back:before{transform-origin:bottom;animation:.3s cubic-bezier(.37,.01,.94,.35) both flipTop}.flip .card__back .card__bottom{transform-origin:top;animation:.6s cubic-bezier(.15,.45,.28,1) flipBottom}@keyframes flipTop{0%{z-index:2;transform:rotateX(0)}0%,99%{opacity:.99}to{opacity:0;transform:rotateX(-90deg)}}@keyframes flipBottom{0%,50%{z-index:-1;opacity:0;transform:rotateX(90deg)}51%{opacity:.99}to{opacity:.99;z-index:5;transform:rotateX(0)}}