egui / Bevy - Transparent Window styling

transparent-egui-window.rs

fn ui_example_system(mut contexts: EguiContexts) {
    // Set window styles
    let ctx = contexts.ctx_mut();
    let old = ctx.style().visuals.clone();
    ctx.set_visuals(egui::Visuals {
        window_fill: Color32::TRANSPARENT,
        panel_fill: Color32::TRANSPARENT,
        window_stroke: egui::Stroke {
            color: Color32::TRANSPARENT,
            width: 0.0,
        },
        window_shadow: epaint::Shadow {
            color: Color32::TRANSPARENT,
            ..old.window_shadow
        },
        ..old
    });

    // Create window + UI
    egui::Window::new("Hello").title_bar(false).show(ctx, |ui| {
        ui.label("world");
    });
}