code: function constructOverlay(box) {
  
    var offset = 6;
    var w = box.width + offset * 2;
    var h = box.height + offset * 2;
  
    var styles = [
      'width: '+ w +'px',
      'height: '+ h + 'px'
    ].join('; ');
  
    return {
      position: {
        bottom: h - offset,
        right: w - offset
      },
      show: true,
      html: '<div style="' + styles + '" class="' + SearchPad.OVERLAY_CLASS + '"></div>'
    };
  }
docs: Construct overlay object for the given bounding box.
  
  @param  {BoundingBox} box
  @return {Object}