(...)

// UI part
pub fn run_ui(
    config: &AppConfig,
    header: Option<String>,
    content: String,
) -> Result<(), eframe::Error> {
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default()
            .with_app_id(String::from("evilbee-notification"))
            .with_inner_size([
                config.width.unwrap_or(160.0),
                config.heigth.unwrap_or(120.0),
            ])
            .with_resizable(false)
            .with_taskbar(false)
            .with_decorations(true)
            .with_position([0.0, 0.0])
            .with_window_level(egui::WindowLevel::AlwaysOnTop),
        ..Default::default()
    };
    eframe::run_native(
        "EvilBee Notification",
        options,
        Box::new(|cc| {
            // This gives us image support:
            egui_extras::install_image_loaders(&cc.egui_ctx);

            Box::new(EvilBeeUI {
                header,
                content,
                timer: 0,
            })
        }),
    )
}

(...)