.dzs--preloader-spinner {
  display: inline-block;
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255,255,255,.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin-me 1s ease-in-out infinite;
  transform-origin: center center;

  position: absolute;
  top: 50%;
  left:50%;
  margin-left: -25px;
  margin-top: -25px;
}

@keyframes spin-me {
  from { transform: rotate(0deg)  ; }
  to { transform: rotate(360deg)  ; }
}