Timeless (desktop width) looks like it is missing some styling, as there's a thin gray border on the page that seems to run adjacent to the various settings without any sort of padding. The border surrounds each of the groups.
Tested on live with ?ooui=1. Firefox 62.0 64-bit on Windows 10.
- I don't know if the border is intentional (If the same test with ?ooui=1&useskin=vector is an indication, no, unintentional).
- The padding is missing if it is intentional.