manifest.json

{
  "name": "Simple Calculator",
  "short_name": "Calculator",
  "display": "standalone",
  "version": "16.0",
  "version_name": "16 realese",
  "categories": ["productivity", "utilities"],
  "description": "A simple and modern calculator PWA web app.",
  "start_url": "/index.html?ver=16",
  "theme_color": "#004A77",
  "background_color": "#000",
  "scope": "/",
  "icons": [
    {
      "src": "icon-192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "icon-512-maskable.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "icon-512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "screenshots": [
    {
     "src": "https://i.imgur.com/Xoa7T1U.jpg",
      "sizes": "1080x2285",
      "type": "image/jpeg",
      "form_factor": "narrow",
      "label": "Calculator"
    },
    {
     "src": "https://i.imgur.com/hYrQrDL.jpg",
      "sizes": "1080x2285",
      "type": "image/jpeg",
      "form_factor": "narrow",
      "label": "Calculator"
    },
    {
     "src": "https://i.imgur.com/x618czZ.jpg",
      "sizes": "1080x2285",
      "type": "image/jpeg",
      "form_factor": "narrow",
      "label": "Calculator"
    }
]

}