.loader {
  border: 16px solid transparent;
  border-radius: 50%;
  border-top: solid grey;
  border-bottom: solid grey;
  border-left: solid grey;
  border-width:thin;
  width: 50px;
  height: 50px;
  -webkit-animation: spin 1s linear infinite; /* Safari */
  animation: spin 1s linear infinite;
  position: fixed;
}

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

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