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: 15vw;
   margin: auto;
   top: 0; left: 0; bottom: 0;  right: 0;
  }