manifest.json

{
  "name": "Smash Karts",
  "short_name": "Smash Karts",
  "theme_color": "#2196f3",
  "background_color": "#2196f3",
  "display": "fullscreen",
  "orientation": "landscape",
  "scope": ".",
  "icons": [
    {
      "src": "images/icon-144.png",
      "sizes": "144x144",
      "type": "image/png"
    },
    {
      "src": "images/icon-512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "start_url": "./"
}