.loading {
  z-index: 9000;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  background: #f0f0f0;
}
.loading > img {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -90px 0 0 -90px;
}