Index grid keeps expanding over max width of site. Jasper template

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I'm having a similar issue Croomo originally posted in this thread.
The Jasper template has a default has a "full width" default for the project thumbnails on the index page.
I have a max-width header and navigation that is set to 1800px that I would like to apply to the index thumbnail as well.
This seems like it should be a pretty quick fix.

This line of code ended up fixing the issue or me...

#page { max-width: 1920px;}