manifest.json

{
    "theme_color":      "#13171f",
    "background_color": "#13171f",
    "display":      "standalone",
    "start_url":    "./index.html",
    "lang":         "en-US",
    "name":         "Polyrise",
    "short_name":   "Polyrise",
    "description" : "Free Mobile Website Builder! Create awesome responsive websites. Easy and fast - No coding! Free for commercial use.",
    "icons": [
      {
        "src":     "./app/imgs/icon-192x192.png",
        "sizes":   "192x192",
        "type":    "image/png",
        "purpose": "any"
      },
      {
        "src":     "./app/imgs/icon-256x256.png",
        "sizes":   "256x256",
        "type":    "image/png",
        "purpose": "any"
      },
      {
        "src":     "./app/imgs/icon-384x384.png",
        "sizes":   "384x384",
        "type":    "image/png",
        "purpose": "any"
      },
      {
        "src":     "./app/imgs/icon-512x512.png",
        "sizes":   "512x512",
        "type":    "image/png",
        "purpose": "maskable"
      }
    ]
  }