How to add border and text in webgl_multiple_views three js Example?

Questions
1

in this three js example, https://threejs.org/examples/webgl_multiple_views.html am trying to add some border for each view and some text in the center since three js treat as a single canvas so I could not add via HTML and CSS.

2

I might be easier to apply your intended stylings by using multiple canvases like in the following example instead.

https://threejs.org/examples/webgl_multiple_canvases_complex

3

/cc