The right page sizes for proper transistions

[TimBox]

Hello all (again )

Sorry might be a stupid question....

I have a 3 size site

Mobile 500px (says to 690)
Tablet 880px (says to 1000)
Main 1000px (an up)

Issue is as you may guess that pages 690 an up jumps to the the 880 size and do not fit.

No idea what to do to fix it. I did not tell it to go to 690 and change to the 880 version

ps to see the issue https://steamqualityinnovations.com/index.htm

Thanks

One last question is it possible to make xara generate html not htm files?

Tim