#black_foreground {
  position: fixed;
  top: 0px;
  left: 0px;
  display: none;
  width: 100%;
  height: 100%;
  /*background-color: #000000;*/
  background: url('./cerna50.png');
  text-align: center;
  line-height: 100%;
  vertical-align: middle;
  z-index: 999999;
}

#img_foreground {
  position: relative;
  margin: 0px auto;
  margin-top: 50px;
  border: 2px solid grey;
}