.loader {
  transform: translateZ(1px);
}

.loader:after {
  content: '$';
  display: inline-block;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  text-align: center;
  line-height: 40px;
  font-size: 32px;
  font-weight: bold;
  background: #FFD700;
  color: #DAA520;
  border: 4px double;
  box-sizing: border-box;
  box-shadow: 2px 2px 2px 1px rgba(0, 0, 0, .1);
  animation: coin-flip 4s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

@keyframes coin-flip {
  0%, 100% {
    animation-timing-function: cubic-bezier(0.5, 0, 1, 0.5);
  }

  0% {
    transform: rotateY(0deg);
  }

  50% {
    transform: rotateY(1800deg);
    animation-timing-function: cubic-bezier(0, 0.5, 0.5, 1);
  }

  100% {
    transform: rotateY(3600deg);
  }
}