Full width page with header and footer

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Hi,

Is it possible to either make a single page full width and keeping the header and footer or to use the “.post-inner { width: 820px; }” on only one page? (1st option preferred)

I have tried to copy the template that is described here: https://wordpress.org/support/topic/changing-content-width-on-particular-pages-only/ but it seems like the width stays the same.

Hope you can help.

Thank you in advance