.mdw-spinner {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1500;
  background-color: rgba(255, 255, 255, 0.5);
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s, visibility 0.3s; }
  .mdw-spinner.mdw-spinner--visible {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.3s, visibility 0.3s; }