anchor.diff:    .rs-flip01
       .rs-front, .rs-back
         -webkit-backface-visibility: hidden
  -      -moz-backface-visibility: hidden
         backface-visibility: hidden
       .rs-back
         -webkit-transform: rotate3d(1, 0, 0, -180deg)
  -      -moz-transition: rotate3d(1, 0, 0, -180deg)
         transition: rotate3d(1, 0, 0, -180deg)
       &.rs-show .rs-card
         -webkit-animation: rs-flip01 1s ease-in-out forwards
  -      -moz-animation: rs-flip01 1s ease-in-out forwards
         animation: rs-flip01 1s ease-in-out forwards
   
   @-webkit-keyframes rs-flip01
  
positive.code:     position: absolute
    .rs-card, .rs-cover, .rs-transition
      -webkit-transform-style: preserve-3d
      -moz-transform-style: preserve-3d
      -o-transform-style: preserve-3d
      transform-style: preserve-3d
  
  /* ********************** ********************** ************ ********************** ********************** */
  
negative.code:   .rs-flip02
      .rs-front, .rs-back
        -webkit-backface-visibility: hidden
        backface-visibility: hidden
      .rs-back
        -webkit-transform: rotate3d(1, 0, 0, -180deg)
        transform: rotate3d(1, 0, 0, -180deg)
      &.rs-show .rs-card
        -webkit-animation: flip02 1s ease-in-out forwards
        -webkit-transform-origin: 50% 0%
        animation: flip02 1s ease-in-out forwards
        transform-origin: 50% 0%
  
  @-webkit-keyframes flip02
    0%
  