message: improving loading splash screen
diff: </head>
  <body style="overflow-y: scroll; padding-right: 0 !important;">
  -<app-pi-gallery2>Loading...</app-pi-gallery2>
  +<app-pi-gallery2>
  + <app-pi-gallery2>
  + <div style="position: absolute;
  + top: 50%;
  + transform: translate(-50%, -50%);
  + left: 50%;
  + text-align: center">
  + <img src="assets/icon.png" style="max-width: 256px"/>
  + <h2>Loading...</h2>
  + </div>
  + </app-pi-gallery2>
  +</app-pi-gallery2>
  </body>
  </html>
  