The dlux UI Overlay is built with bootstrap 4 (Get Bootstrap)

The XR scene, or any other type of HTML5 canvas experience you build, has a layer above it called the UI Overlay.

This overlay has all the same blockchain functionality as the XR layer, and can be treated as a menu, in game game, or any other use case you can dream up.

You can even use the UI Overlay without an XR canvas.