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In photobooth/gui/Qt5Gui/stylesheets are the styleseheets for either of the layouts.
photobooth/gui/Qt5Gui/stylesheets
Simply edit these files or, even better, add a new one and make it available in photobooth/gui/Qt5Gui/__init__.py.
photobooth/gui/Qt5Gui/__init__.py
The syntax is more or less identical to CSS (as known from websites).