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Whisker sets the popup's GTK widget name via gtk_widget_set_name(), which CSS matches as #id, not .class. All prior .whisker-menu / .whiskermenu-window rules matched nothing. Switch to #whiskermenu-window (also outranks the base window.background gray rule). Whole popup — list/icon views, search entry, category buttons — now uses @menu_bg. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>