[chrismorgan]

Here’s an example on my site: https://chrismorgan.info/blog/rust-fizzbuzz/

That’s left-aligned (margin-left: 0; margin-right: 0) rather than centre-aligned (margin-left: auto; margin-right: auto), but it gets the point across. Headings, paragraphs, list items, &c. all get their widths constrained (deliberately to different points, in my case, which wouldn’t work if you were going centre-aligned), but figures can be full-bleed simply by not having that max-width (though in my case they still need negative side margins, but of known values).