{
  "short_name": "App shell",
  "name": "App shell",
  "start_url": "./?utm_source=web_app_manifest",
  "icons": [
    {
      "src": "/images/chrome-touch-icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ],
  "display": "standalone",
  "orientation": "portrait"
}

{
  "short_name": "App shell",
  "name": "App shell",
  "start_url": "./?utm_source=web_app_manifest",
  "icons": [{
        "src": "images/icon-128x128.png",
        "sizes": "128x128",
        "type": "image/png"
      }, {
        "src": "images/apple-touch-icon.png",
        "sizes": "152x152",
        "type": "image/png"
      }, {
        "src": "images/ms-touch-icon-144x144-precomposed.png",
        "sizes": "144x144",
        "type": "image/png"
      }, {
        "src": "images/chrome-touch-icon-192x192.png",
        "sizes": "192x192",
        "type": "image/png"
      },{
        "src": "images/chrome-splashscreen-icon-384x384.png",
        "sizes": "384x384",
        "type": "image/png"
      }],
  "display": "standalone",
  "orientation": "portrait",
  "background_color": "#3E4EB8",
  "theme_color": "#2E3AA1"
}

Add cross-device icons, theme + bg color
Add cross-device icons, theme + bg color
