body {
  position: relative;
}
body .background-image {
  background-image: url("/themes-overwrite/default/member/images/gray.png");
  background-size: cover;
  background-position: center center;
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0.4;
  top: 0;
  z-index: -1;
  animation: Pulsate 3s ease-in-out;
}
@keyframes Pulsate {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}