fix: Use flexbox helpers

src/features/savegame/ui/load.rs

@@ -9,9 +9,7 @@ pub fn spawn_load_popup(commands: &mut Commands) {
                 position_type: PositionType::Absolute,
                 width: percent(100),
                 height: percent(100),
-                justify_content: JustifyContent::Center,
-                align_items: AlignItems::Center,
-                ..default()
+                ..Node::center()
             },
             ZIndex(1),
             BackgroundColor(Color::srgba(0.0, 0.0, 0.0, 0.8)),
@@ -22,13 +20,11 @@ pub fn spawn_load_popup(commands: &mut Commands) {
                     Node {
                         width: px(600.0),
                         height: px(500.0),
-                        flex_direction: FlexDirection::Column,
-                        align_items: AlignItems::Center,
                         padding: UiRect::all(px(20.0)),
-                        ..default()
+                        ..Node::vstack(px(10))
                     },
                     BackgroundColor(Color::srgb(0.2, 0.2, 0.2)),
-                    BorderRadius::all(Val::Px(10.0)),
+                    BorderRadius::all(px(10.0)),
                 ))
                 .with_children(|parent| {
                     parent.spawn((
@@ -79,12 +75,10 @@ pub fn spawn_load_popup(commands: &mut Commands) {
                                     Node {
                                         width: percent(100),
                                         height: px(80),
-                                        justify_content: JustifyContent::Center,
-                                        align_items: AlignItems::Center,
                                         flex_direction: FlexDirection::Row,
                                         column_gap: px(10.0),
                                         padding: UiRect::horizontal(px(10.0)),
-                                        ..default()
+                                        ..Node::center()
                                     },
                                     BackgroundColor(ButtonVariant::Secondary.normal_background()),
                                     BorderRadius::all(px(10)),

src/features/start_screen/mod.rs

@@ -20,11 +20,9 @@ fn setup(mut commands: Commands) {
         Node {
             width: percent(100),
             height: percent(100),
-            justify_content: JustifyContent::Center,
-            align_items: AlignItems::Center,
             flex_direction: FlexDirection::Column,
             row_gap: px(10),
-            ..default()
+            ..Node::center()
         },
         children![
             (

src/features/ui/ui/mod.rs

@@ -2,3 +2,4 @@ pub mod button;
 pub mod flexbox;
 
 pub use button::{button, pill_button};
+pub use flexbox::Flexbox;