 background-position: bottom right; }
   .case.c .test { background-position: 100% bottom; }
   .case.d .test { background-position: right 100%; }
   .case.e .test { background-position: 100% 58px; }
   .case.f .test { background-position: 108px 100%; }

   .g .control, .h .control, .i .control, .j .control, .k .control, .l .control, .m .control { background-position: 54px 28px; }
   .case.g .test { background-position: center center; }
   .case.h .test { background-position: 50% 50%; }
   .case.i .test { b