.onam-flip-clock {
  text-align: center;
  perspective: 400px;
  margin: 20px auto;
}
.onam-flip-clock *,
.onam-flip-clock *:before,
.onam-flip-clock *:after { box-sizing: border-box; }
.onam-flip-clock__piece {
  display: inline-block;
  margin: 0 5px;
}
.onam-flip-clock__slot {
  font-size: 1rem;
}
.onam-card {
  display: block;
  position: relative;
  padding-bottom: 0.72em;
  font-size: 5rem;
  line-height: 0.95;
}
.onam-card__top,
.onam-card__bottom,
.onam-card__back::before,
.onam-card__back::after {
  display: block;
  height: 0.72em;
  color: #ccc;
  background: #222;
  padding: 0.25em 0.25em;
  border-radius: 0.15em 0.15em 0 0;
  backface-visibility: hidden;
  transform-style: preserve-3d;
  width: 1.8em;
  transform: translateZ(0);
}
.onam-card__bottom {
  color: #FFF;
  position: absolute;
  top: 50%;
  left: 0;
  border-top: solid 1px #000;
  background: #393939;
  border-radius: 0 0 0.15em 0.15em;
  pointer-events: none;
  overflow: hidden;
}
.onam-card__bottom::after {
  display: block;
  margin-top: -0.72em;
}
.onam-card__back::before,
.onam-card__bottom::after {
  content: attr(data-value);
}
.onam-card__back {
  position: absolute;
  top: 0;
  height: 100%;
  left: 0%;
  pointer-events: none;
}
.onam-card__back::before {
  position: relative;
  z-index: -1;
  overflow: hidden;
}
.onam-flip .onam-card__back::before {
  animation: flipTop 0.3s cubic-bezier(.37,.01,.94,.35);
  animation-fill-mode: both;
  transform-origin: center bottom;
}
.onam-flip .onam-card__back .onam-card__bottom {
  transform-origin: center top;
  animation-fill-mode: both;
  animation: flipBottom 0.6s cubic-bezier(.15,.45,.28,1);
}
@keyframes flipTop {
  0% { transform: rotateX(0deg); z-index: 2; }
  0%, 99% { opacity: 0.99; }
  100% { transform: rotateX(-90deg); opacity: 0; }
}
@keyframes flipBottom {
  0%, 50% { z-index: -1; transform: rotateX(90deg); opacity: 0; }
  51% { opacity: 0.99; }
  100% { opacity: 0.99; transform: rotateX(0deg); z-index: 5; }
}