Flatiron Gallery Styles Question

Site URL: https://robvisual.com/

I currently have my project detail width set to 1700px in my GALLERY STYLES section.  Im wondering if there is a custom code I can enter to change that max width for specific gallery pages.  for example this one.... https://robvisual.com/#/albert-wilson/ wider, and this one https://robvisual.com/#/salon-tech-ad/ more narrow.  Thanks a bunch. 

If you can edit each page, try adding a Code Block > Paste this code

<style>
  section#container {
    max-width: 100% !important;
}
</style>

Hello thanks.  its a gallery page so I dont think I can add a code block, or can I? Theres "page header code injection" but that says its a premium feature