@keyframes lds-hourglass {
  0% {
    transform: rotate(0);
    animation-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19);
  }
  50% {
    transform: rotate(900deg);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }
  100% {
    transform: rotate(1800deg);
  }
}

.btn {
  display: flex;
  align-items: center;
  .lds-hourglass {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
  }
  .lds-hourglass:after {
    content: " ";
    display: block;
    border-radius: 50%;
    width: 0;
    height: 0;
    margin: 8px;
    box-sizing: border-box;
    border: 32px solid #333;
    border-color: #333 transparent #333 transparent;
    animation: lds-hourglass 1.2s infinite;
  }
}
