Remove fullscreen window decoration/border Chrome OS app/kiosk mode

I have a web application that I want to run in kiosk mode on a chromebox. So far I've pretty much got it all working, but I can't seem to get rid of the annoying big white border around the screen. A screenshot of the top left corner of the screen (fullscreen). I have added a black border to outline the image.

Example screenshot

My web application starts at the blue, the white border is added by Google Chrome.

My app's manifest.json:

    "manifest_version": 2,
    "name": "snipped",
    "description": "snipped",
    "version": "1.0",
    "icons": {
        "128": "128.png"
    "app": {
        "background": {
            "scripts": [ "background.js" ],
            "persistent": false
    "permissions": [
    "kiosk_enabled": true,
    "kiosk_only": true

The file that creates the app window (background.js): {
    var options = {
        state: 'fullscreen',
        resizable: false,
        alwaysOnTop: true,
        bounds: {
            top: 0,
            left: 0,
            width: 1920,
            height: 1080
        frame: 'none' // Not hiding anything
    };'application.html', options);

The application's just a webview (application.html):

<!DOCTYPE html>
    <meta charset='utf-8'>
    <link rel="stylesheet" type="text/css" href="application.css">

    <webview src=""></webview>

And the stylesheet stretches the webview to full dimensions (application.css):

webview {
    height: 100%;
    width: 100%;

Even though I have set the frame to 'none', it doesn't seem to remove the window frame. How to achieve the true fullscreen experience. Similar to how it looks when I press F11 on my desktop's Google Chrome:

Example of what I want



In Chromium, the <body> tag has a default margin of 8 pixels. If you want to dedicate all space to the webview, make sure that the margin is 0, by using the following stylesheet:

html, body, webview {
    margin: 0;
    padding: 0;
    border: 0;
    display: block;
    width: 100%;
    height: 100%;


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