How do I target Ajax Loader Throbber in CSS? I recently installed Ajax Loader and it working great. However, I need some custom styling so, I can display the loading throbber in the center of the screen.

I can write my own CSS, But can't find the target class of Ajax Loader.

Looking forward for any help on this issue. Thanks in advance
To target the overlay you can use .ajax-progress and to target the throbber you can use .ajax-throbber.

Something like this would position the throbber on the center of the screen: 

.ajax-progress {
  position: fixed;
  z-index: 99999999;
  background: rgba(255,255,255,0.6);
  text-align: center;
  width: 100%;
  height: 100%;
  top:0;
  left:0;
}

.ajax-throbber {
  left: 0;
  position:absolute;
  right:0;
  top: 50%;
  transform: translateY(-50%);
}