ackground-position: center 50%; }
   .case.j .test { background-position: 50% center; }
   .case.k .test { background-position: 50%; }
   .case.l .test { background-position: center; }
   .case.m .test { background-position: 54px; }

   .n .control, .o .control { background-position: 54px 56px; }
   .case.n .test { background-position: bottom center; }
   .case.o .test { background-position: center bottom; }

   .p .control, .q .control { background-position: 108px 28px; }
   .case.p .test { background-posi