.spinner {
  width: 48px;
  height: 48px;
  border: 5px solid white;
  border-bottom-color: transparent;
  border-radius: 50%;
  display: inline-block;
  box-sizing: border-box;
  animation: spinner-rotation 800ms linear infinite;
}

@keyframes spinner-rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}