gtk3, gtk4 (probably?) qt, qt in flatpak, gtk3 in flatpak, gtk4 in flatpak (probably)... I'm just not fighting it anymore
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I have a theory that if everything was pixel perfect, centered, perfectly aligned and looked the same, the thing would look too sterile. There's basically a perfect world, written down in books and texts that is being taught to students and there's the real world. In many areas, these two do not match and the above image is the result of someone's text book world view not matching the real world.
Could the discover store have a better UI? Yes. Will a centered, down-anchored, pixel perfect button make it better? Subjective.
Wabi sabi windows!