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gtkthemesgtk3

How to theme the header bar close button in GTK+3?

I'd like to change the style of the close button on GTK+3 windows with so called "header bars", where the window is rendered without decoration and GTK composes title bar and widgets.

What kind of element is the "X" close button, and what CSS classes does it belong to (if any)?

Screenshot

Note that this is not part of the window manager theme but actually drawn by GTK+.

Solution

  • It's a GtkButton with icon window-close-symbolic with style class titlebutton (the same class as the other buttons on the header), assuming the app is using the built-in close button.