.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.6);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  position: relative;
  top: 50%;
  left: 50%;
  display: block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}