.ajax-throbber {
  width: 55px;
  height: 55px;
  position: relative;
}
.ajax-throbber.sk-cube-grid .sk-cube  {
  background-color: #000 !important;
}

/* Override core throbber */
.ajax-progress.ajax-progress-fullscreen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.6);
  background-image: none;
  z-index: 11000;
  position: fixed;
  height: 100%;
  width: 100%;
  overflow: hidden;
  margin: auto;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}