html,
body {
  height: 100%;
  margin: 0;
}

#fullPageSpinner {
  height: 100%;
  background-color: #000;
  opacity: 0.7;
}
#fullPageSpinner img {
  width: 100%;
  position: absolute;
  top: 0;
  bottom: 50px;
  margin: auto;
}