Maybe removed button highlighting on mobile.

views/index.css

@@ -113,4 +113,5 @@ body{
     font-size: 22px;
     cursor: pointer;
     position: relative;
+    -webkit-tap-highlight-color: transparent;
 }

views/manifest.json

@@ -3,7 +3,7 @@
     "short_name": "Workout",
     "start_url": "/",
     "display": "standalone",
-    "background_color": "#1A1A1A",
+    "background_color": "#1a1a1a",
     "theme_color": "#F46036",
     "icons": [{
         "src": "/logo.png",