docs: function () {
              var state = this.state,
                  zoomState = state.zoomState,
                  zoom = zoomState.zoom,
                  zoomedWidth = state.sumWidths,
                  zoomedHeight = Math.floor(state.tallestPage.totalActualHeight * zoom),
                  docWidth = Math.max(zoomedWidth, state.viewportDimensions.clientWidth),
                  docHeight = Math.max(zoomedHeight, state.viewportDimensions.clientHeight);
  
              this.$doc.css({
                  height: docHeight,
                  lineHeight: docHeight + 'px',
                  width: docWidth
              });
          }