div.ajax-loader{
  position:fixed;
  top:0;
  bottom:0;
  left:0;
  right:0;
  z-index:9999;
  background-color:rgba(0,0,0,.8);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
}

div.ajax-loader h1{
  color:white;
  font-size:14px;
  text-align:center;
}