QGIS three.je divs/tables

I am using QGIS three.js to visualize mountain terrain and terrain parameters. The problem: The finished website “swallows” all divs with text. Why is that? I also want to include a table or insert to include a simple image (legend) and text to the left of the rendered DTM - which also does not work.
Any suggestions how to make the divs visible?

EDIT: I am trying to post the html - how so in the best way?

Maybe you can provide a fiddle with your code?

Edit - I found a simple work-around using framesets. That works quite well for the intended purpose!