canvas
  background-image: url( http://blogoscoped.com/files/scanimation-cat.png )
  background-size: auto
  background-repeat: no-repeat
  background-position: center center
  margin-top: -213px
  margin-left: -401px
  position: absolute
  cursor: ew-resize
  top: 50%
  left: 50%
  width: 803px
  height: 426px