Actually, I just opened the site in Firefox's "responsive design mode" web-dev tool. The site is responsive up to about 1023 pixels wide, after which it no lon

Actually, I just opened the site in Firefox's "responsive design mode" web-dev tool. The site is responsive up to about 1023 pixels wide, after which it no longer re-flows at all. It just becomes a 1023 pixel wide site inside of a much wider browser window. I think the OP's point was that they wanted the "responsiveness" to not have an upper limit of width. That if (example) they had a 4k monitor that was 2,160 pixels wide, and they maximized the browser window, they wanted the site layout to reflow to use all 2,160 (minus window decorations) of pixel width to lay out content. As it is now, if they had a monitor that wide, the site will only ever use 1,023 pixels of width to lay itself out, leaving large margins of unused space on the sides. [edit]: A bit more research shows this CSS declaration on a <div> with the class of "container": max-width: 964px;. Turning off that one CSS declaration allows the site to widen to fit a maximized browser window.