Fix a couple UI issues

Author: benfrankel

assets/config/card.ron

@@ -3,7 +3,7 @@
     // Deck:
     deck_cap: 18,
     deck_height: Px(96.0),
-    deck_column_gap: Px(-4.0),
+    deck_column_gap: Px(-6.0),
 
     // Cards:
     card_background_map: {

src/screen/playing.rs

@@ -161,7 +161,7 @@ fn upper_hud(mut entity: EntityWorldMut) {
                     width: Percent(100.0),
                     align_items: AlignItems::Center,
                     justify_content: default(),
-                    margin: UiRect::all(Px(16.0)),
+                    padding: UiRect::all(Px(16.0)),
                     column_gap: Px(16.0),
                     ..default()
                 },