The entry in gnome-shell.css that controls the coer radius of "title bar"

Is there an entry in gnome-shell.css that control the coer radius of "title bar" (if I use the correct term) of most windows? As shown in the picture An example of the coer radius of "title-bars". I want to reduce the coer radius, since I reduce the height of title bars. Now the coer looks pretty ugly (personally I don't like rounded coers).

I have checked almost all entries, however, still not finding it. Anyone having ideas? Many thanks!

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