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In the old design, when they wrapped onto multiple lines, various bad things happened. The lines overlapped one another, the lines got broken within buttons but not between buttons, and if they had got broken between buttons the left button on each line would have lacked a left border. I've made two major changes to fix this. First, I've switched from flow layout to flex layout. This has much better default behaviour, breaking lines in the right places, not overlapping lines, and even arranging line-wrapping within a button when the viewport gets really narrow. Second, I've given each button a border on all four sides and then used negative margins to overlap them. This required changing the borders from transparent black to opaque grey to make them display correctly when overlapping. The result is not quite identical to the old version on a wide viewport, but I think it's as close as I can get while keeping the new CSS pleasant. Ideally, the separator would vanish when it was adjacent to a line break, but I've not worked out how to do that yet.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.