.loader {
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  border: 4px solid #ffffff;
  border-radius: 50%;
  border-top: 4px solid #727272;
  width: 20px;
  height: 20px;
  -webkit-animation: spin 0.75s linear infinite; /* Safari */
  animation: spin 0.75s linear infinite;
}

/* Safari */
@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}