manifest.json

{
    "name": "Project OpenUBL",
    "short_name": "OpenUBL",
    "theme_color": "#2196f3",
    "background_color": "#424242",
    "display": "standalone",
    "scope": "./",
    "start_url": "./index.html",
    "icons": [
        {
            "src": "img/icons/icon-16x16.png",
            "sizes": "16x16",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-24x24.png",
            "sizes": "24x24",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-32x32.png",
            "sizes": "32x32",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-48x48.png",
            "sizes": "48x48",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-64x64.png",
            "sizes": "64x64",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-128x128.png",
            "sizes": "128x128",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-256x256.png",
            "sizes": "256x256",
            "type": "image/png"
        },
        {
            "src": "img/icons/icon-512x512.png",
            "sizes": "512x512",
            "type": "image/png"
        }
    ]
}