PWA #264 Manifest does not have:

* PNG icon of at least 512px
* `background_color`
* `theme_color`
* maskable icon
* `<meta name="theme-color">` tag

assets/manifest.json

@@ -3,6 +3,8 @@
 	"short_name": "SnappyMail",
 	"description": "Simple, modern & fast web-based email client",
 	"display": "standalone",
+	"background_color": "white",
+	"theme_color": "black",
 	"icons": [{
 		"src": "apple-touch-icon.png",
 		"sizes": "64x64",
@@ -11,6 +13,11 @@
 		"src": "android-icon.png",
 		"sizes": "192x192",
 		"type": "image/png"
+	}, {
+		"src": "logo-512.png",
+		"sizes": "512x512",
+		"type": "image/png",
+		"purpose": "any maskable"
 	}],
 	"start_url": "../../../../"
 }

snappymail/v/0.0.0/app/templates/Index.html

@@ -10,6 +10,7 @@
 	<meta name="apple-mobile-web-app-capable" content="yes">
 	<meta name="google" content="notranslate">
 	<meta name="robots" content="noindex,nofollow,noodp">
+	<meta name="theme-color" content="black">
 	<title></title>
 	<style id="app-boot-css">{{BaseAppBootCss}}</style>
 	<link type="text/css" rel="stylesheet" href="{{BaseAppMainCssLink}}">