Hi Joe,
I started using WP just recently and also am using twenty seventeen. I run into the same dilemma on how to make the pages a bit wider, especially the bbPress forums.
I am completely new to CSS coding but after scouring the forums for some solutions I found this:
1. In your dashboard click Appearance>Edit CSS
2. At the end of what’s there, on a new, line insert this code:
/* wider wrapper in large screens */
@media screen and (min-width: 48em) {
.wrap {
max-width: 1200px;
}
}
You can play with the number in front of “px” to see what fits your needs.
One caveat though is that it will widen all the pages in the theme and I don’t know how to apply this code to specific pages, and I’m sure there is a way.
The beauty of this theme is that you can put this code (or any) in the CSS editor and you see the result immediately, you don’t like it, delete the code no harm done.
Hopefully this helps.
cheers
Roman