div#stage {
  position: absolute; top: 0; right: 0;
  width: 60px; height: 45px; border: 3px double #44a;
  padding: 5px; text-align: center;
  background: white;
  margin-right: 0; margin-left: auto;
  z-index: 2;
}
div#bstage {
  margin-right: 0; margin-left: auto; width: 75px; height: 60px;
  float: right;
}
body > div#stage {position: fixed;}
div#x {
  position: static; height: 100%; padding-top: 45px;
  overflow: auto;
  background: #ffc0cb; /* =pink */
  z-index: 1;
}
body>div#x {position: absolute; padding-top: 0; top: 45px; height: auto;}
img {vertical-align: top;}