feat: black background

unfortunately this means no hover feedback from buttons

src/app/mod.rs

@@ -265,7 +265,7 @@ pub fn run() -> Result<(), impl std::error::Error> {
         .theme(theme::Theme::custom(
             "high-contrast-dark",
             theme::Palette {
-                background: Color::from_rgb8(10, 10, 10),
+                background: Color::BLACK,
                 text: Color::WHITE,
                 ..theme::Palette::DARK
             },