code: function _drawBound (side, dist) {
          dist += 'px';
          switch (side) {
              case 'top':
                  $('.boundary-top').css({
                      top: dist,
                      height: dist,
                      marginTop: '-' + dist
                  });
                  break;
  
              case 'right':
                  $('.boundary-right').css({
                      right: dist,
                      width: dist,
                      marginRight: '-' + dist
                  });
                  break;
  
              case 'bottom':
                  $('.boundary-bottom').css({
                      bottom: dist,
                      height: dist,
                      marginBottom: '-' + dist
                  });
                  break;
  
              case 'left':
                  $('.boundary-left').css({
                      left: dist,
                      width: dist,
                      marginLeft: '-' + dist
                  });
                  break;
  
              default:
                  break;
          }
      }
docs: Overlay a boundary line on the viewport when one is set by the user