Global container width issue

I’m not the most technical website builder, but I can usually figure out WordPress issues. This time I’m stumped. My employer hosts client websites including 2 of our own organization’s sites which I have primarily created over time. The other day I noticed that all our sites content looks like there is about 100px padding on the right and left sides. I went in and checked and the containers are still 1140px. No one has made any changes or edited the site. It seems as though I’m viewing the screen at about 80%, but it’s 100%. Could this be a result of outdated php? Has anyone ever had this happen?

 

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