@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.loading {
    display: inline-block;   /* ensures it takes space */
    border-radius: 50%;
    width: 48px;
    height: 48px;
    border: .25rem solid rgba(255, 255, 255, 0.8);
    border-top-color: #ffffff;
    animation: spin 750ms infinite linear;
}