How to change the width of a chapter

[carboML]

Hi!
I am wondering how to change the width of the article or chapter. The images that I have to use would be better looking if the width of the whole article increases. Anyone knows how to do this?

Thanks!!

[hawksheng]

I just modified file "themes/ananke/layouts/_default/single.html" at line 50.
Replaced the width value w-two-thirds-l of this dev to w-100, and it works. :)