#wrapper{
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: white;
  z-index: 10000;
}
.center-image
{
  position: fixed;
  margin: auto;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 100px;
}