Web container background color

I’m sorry, this may be a dumb question. I am not a programmer and am still learning. How can I change the background colour of a web container? I can add a rectangle and fill colour, but why can’t I just set the container background? Is there a right way to do it? Can someone please guide me?
Thanks

You should be able to set the background in the container’s open event with

me.style.backgroundcolor = Color.RGBA(255, 0, 0) ’ Set the color to red

Thank you that worked, easy.