anchor.diff:  
         _.extend feedback_style, 
           position: 'absolute'      
  -        top: if sticky then -38 else -80      
  +        top: if sticky then -57 else -80      
           left: feedback_left
           marginLeft: -feedback_width / 2
           width: feedback_width
  
positive.code:       height: SLIDER_HANDLE_SIZE - 4
        boxShadow: '3px 3px 0 0 white'
        transform: 
          "scale(#{.4 + .3 * Math.abs(stance) }, #{.08 + .4 * stance}) 
           translate(0, #{-2 - 5 * Math.abs(stance)}px) 
           rotate(45deg)"
  
  
negative.code:       height: 3
        transform: "scale(#{.8 + .2 * Math.abs(stance)}, #{.8 + .2 * Math.abs(stance)})"
  
      mouth_scale_y = .4 * stance
      face_mouth_style = 
        bottom: -1
        width: SLIDER_HANDLE_SIZE - 4
  