.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);
    }
  
    100% {
      transform: rotateY(1800deg);
      animation-timing-function: cubic-bezier(0, 0.5, 0.5, 1);
    }
  
    100% {
      transform: rotateY(3600deg);
    }
  }