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How do i edit the css template to widen the body of my website? - template css cannabis

Ok so the new to the design of this website and know just how HTML and JavaScript, and I have no idea how to modify the template CSS in all

Then I asked how he could expand the body of my site, I can make as much content, if you tell me how I would be very useful

or if you you want me your e-mail and I'll send you change the file. txt

PLEASE HELP