Size displayed on board <loadURL>

I would like to know how I can define the size at which StageWebView information will be displayed on my stage.

Currently it occupies the entire stage, I would like to know how I can stay with the dimensions below:

width = 320 x height = 245

Thank you in advance, follow the code:

stage.scaleMode = StageScaleMode.NO_BORDER;

import flash.display.MovieClip;
import flash.media.StageWebView;
import flash.geom.Rectangle;
import flash.events.MouseEvent;

var webView: StageWebView = new StageWebView();

click.addEventListener(MouseEvent.CLICK, acc);

function acc (Event:MouseEvent) : void 
{
	webView.stage = this.stage;
	webView.viewPort = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);
	
	webView.loadURL("https://google.com/");
}