manifest.json

{
  "name": "Recursive HTML",
  "scope": "./",
  "icons": [
    {
      "src": "imgs/icon.png",
      "sizes": "600x600"
    },
    {
      "src": "imgs/maskable.png",
      "sizes": "600x600",
      "purpose": "maskable"
    }
  ],
  "background_color": "#bababa",
  "display": "standalone",
  "start_url": "./",
  "theme_color": "#303f9f"
}