Fix manifest

static/manifest.json

@@ -5,15 +5,17 @@
         {
             "src": "/android-chrome-192x192.png",
             "sizes": "192x192",
-            "type": "image/png"
+            "type": "image/png",
+            "purpose": "maskable"
         },
         {
             "src": "/android-chrome-512x512.png",
             "sizes": "512x512",
-            "type": "image/png"
+            "type": "image/png",
+	    "purpose": "maskable"
         }
     ],
-    "theme_color": "white",
+    "theme_color": "#ff6600",
     "background_color": "#ff6600",
-    "display": "standalone"
+    "display": "browser"
 }