Make DOM element receive shadow and shine from PointLight

Alright, I added <button> element but it won’t cast a shadow onto the background element:

I also tried upping the opacity from 0 to 0.8 (line 139) but still no shadow is cast from the “button”:

I’m expecting there to be a rectangular shadow from the button. If you look at line 146 you see that I have

    mesh.castShadow = true;
    mesh.receiveShadow = true;

both true.

@looeee @Fyrestar Any idea why the button’s shadow is not appearing?