Here I am facing a very very irritating problem and tried everything.
Actually, in web viewer my site is loaded partially it means that the whole page is not accessible.
Means, when we try to scroll for more the site is not able to scroll.
did you put the webviewer component into another component, for example an arrangement?
you might want to provide a screenshot of the designer and the components you used on the screen
try a simple project as simple as possible, which does have only a webviewer component, and set width and height of the webviewer to fill parent
then test different html pages
does it work for you?