manifest.json

{
    "background_color": "#000000",
    "display": "fullscreen",
    "icons": [
        {
            "src": "icons/manifest-icon-192.maskable.png",
            "sizes": "192x192",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/manifest-icon-192.maskable.png",
            "sizes": "192x192",
            "type": "image/png",
            "purpose": "maskable"
        },
        {
            "src": "icons/manifest-icon-512.maskable.png",
            "sizes": "512x512",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/manifest-icon-512.maskable.png",
            "sizes": "512x512",
            "type": "image/png",
            "purpose": "maskable"
        }
    ],
    "name": "Etcher Sketcher",
    "orientation": "portrait",
    "short_name": "Etcher Sketcher",
    "start_url": "index.html",
    "theme_color": "#212121"
}