manifest.json

{
  "short_name": "gagle web app",
  "name": "gagle web app",
  "icons": [
    {
      "src": "./android-chrome-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "./android-chrome-512x512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#ffffff",
  "background_color": "#f4f4f9"
}