#hand_b {
  width:31px;
  height:31px;
  background-image: url(img/Bsu.png);
}
#hand_b.selected {
  background-image: url(img/Bsd.png);
}
#line_b {
  width:31px;
  height:31px;
  background-image: url(img/Blu.png);
}
#line_b.selected {
  background-image: url(img/Bld.png);
}
#shape_b {
  width:31px;
  height:31px;
  background-image: url(img/Bpu.png);
}
#shape_b.selected {
  background-image: url(img/Bpd.png);
}