Unable to style the button in GtkComboBox

Hi all.

I am trying to apply the “button.flat” CSS class to the button in GtkComboBox. I have applied the following style class (taken from the button.flat style in the gtk adwaita theme source)

.signup_entry_combobox > box.linked > entry.combo, button.combo {

    border-color: transparent;

    background-color: transparent;

    background-image: none;

    box-shadow: inset 0 1px rgba(255, 255, 255, 0);

    text-shadow: none;

    -gtk-icon-shadow: none;

    transition: none;


Expected result (Glade Previewer):

Actual result (Compiled code):

OS: Windows 10 via Msys2
Gtk version: 3.24.30

Kindly assist.


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