html, body {
  margin: 0; 
  overflow: hidden;
}
#space-container-top {
  opacity: 0.6;
  position: absolute;
  top: 0;
  z-index:10;
}
img.cosmos {
 position: absolute;
 z-index: 20;
 width: 24vw;
 margin: auto;
 top: 0; left: 0; bottom: 0;  right: 0;
}