#ajax-mask {
  display:block;position:fixed;z-index:9998;
  left:0;top:0;width:100%;height:100%;
  background:rgba(0, 0, 40, 0.5);
  text-align:center;line-height:calc(100vh - 128px);
}
#ajax-mask span {position:relative;z-index:99989;color:#0FF;font-size:16px;font-weight:bold;}
#ajax-loader {
  display:block;position:fixed;z-index:9999;
  width:96px;height:96px;
  left:calc(50% - 48px);top:calc(50% - 48px);
  transform:translate(-50%, -50%);
  border:23px solid #f3f3f3;
  border-top:23px solid #1D5476;
  border-radius:50%;
  animation:spin 1.3s linear infinite;
}
@keyframes spin {
  0% {transform:rotate(0deg);}
  100% {transform:rotate(360deg);}
}