manifest.json

{
  "short_name": "Morse Code",
  "name": "Morse Code",
  "icons": [
    {
      "src": "assets/icon96.png",
      "sizes": "96x96",
      "type": "image/png"
    },
    {
      "src": "assets/icon144.png",
      "sizes": "144x144",
      "type": "image/png"
    },
    {
      "src": "assets/icon192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {  
      "src": "assets/icon256.png",  
      "sizes": "256x256",  
      "type": "image/png"  
    },
    {  
      "src": "assets/icon300.png",  
      "sizes": "300x300",  
      "type": "image/png"  
    },
    {  
      "src": "assets/icon384.png",  
      "sizes": "384x384",  
      "type": "image/png"  
    },  
    {  
      "src": "assets/icon512.png",  
      "sizes": "512x512",  
      "type": "image/png"  
    }
  ],
  "start_url": "index.html",
  "display": "standalone",
  "background_color": "#000000",
  "theme_color": "#000000",
}