This may be confusing, so please bear with me!
So, I'm trying to make a website in WebDwarf. I'm quite successful in my layout so far, however, when I preview the site in a new browser, you are able to scroll the site quite a ways down, as well as quite a ways to the right. I don't need that much room for the content of my site, and I don't know how to make it so there is less scroll bar. Is there no way to make the screen heighth and width smaller?

There's no need to reduce your screen dimensions -- which you can't do anyway

The browser decides when to add scrollbars. If it thinks you have a big page, it is probably because you have an object way down in the bottom right corner.

It may be even off the end of your workpage, so it will be effectively invisible. In Web Dwarf, the best way to find it is to open the Quick Properties Editor > Object tab, then use the tab key to tab through all your objects, looking for anything with large (or negative) x and y coordinates. Once you identify something, then you can move or delete it.

Geeky types can also look at the code, checking for anything with strange x, y coordinates.