diff --git a/I18N Commander/App/theme/tabs/background_style_box_flat.tres b/I18N Commander/App/theme/tabs/background_style_box_flat.tres
new file mode 100644
index 0000000..c922a7c
--- /dev/null
+++ b/I18N Commander/App/theme/tabs/background_style_box_flat.tres	
@@ -0,0 +1,9 @@
+[gd_resource type="StyleBoxFlat" format=3 uid="uid://bumfybajbkybi"]
+
+[resource]
+bg_color = Color(0.2, 0.2, 0.2, 1)
+corner_radius_top_left = 12
+corner_radius_top_right = 12
+expand_margin_left = 3.0
+expand_margin_top = 12.0
+expand_margin_right = 12.0
diff --git a/I18N Commander/App/theme/ui_theme_dark.tres b/I18N Commander/App/theme/ui_theme_dark.tres
index 14ef03b..63f93a0 100644
--- a/I18N Commander/App/theme/ui_theme_dark.tres	
+++ b/I18N Commander/App/theme/ui_theme_dark.tres	
@@ -1,4 +1,4 @@
-[gd_resource type="Theme" load_steps=8 format=3 uid="uid://uqhultm05f5a"]
+[gd_resource type="Theme" load_steps=9 format=3 uid="uid://uqhultm05f5a"]
 
 [ext_resource type="StyleBox" uid="uid://chaurklijlgu7" path="res://theme/btn/d_style_box_flat_focus.tres" id="1_uspte"]
 [ext_resource type="StyleBox" uid="uid://l1tjpnljc6c1" path="res://theme/btn/d_style_box_flat_hover.tres" id="2_pm5yo"]
@@ -7,6 +7,7 @@
 [ext_resource type="StyleBox" uid="uid://bgka0t482q0dh" path="res://theme/checkbox/style_box_empty.tres" id="5_1ugrl"]
 [ext_resource type="StyleBox" uid="uid://batay7mp6vfon" path="res://theme/checkBtn/style_box_empty.tres" id="6_i1h00"]
 [ext_resource type="StyleBox" uid="uid://cens6ndafk28w" path="res://theme/panel/d_style_box_flat.tres" id="7_3s8mj"]
+[ext_resource type="StyleBox" uid="uid://bumfybajbkybi" path="res://theme/tabs/background_style_box_flat.tres" id="8_l6mbx"]
 
 [resource]
 Button/constants/h_separation = 6
@@ -40,4 +41,5 @@ PopupMenu/font_sizes/font_separator_size = 32
 PopupMenu/font_sizes/font_size = 32
 TabBar/font_sizes/font_size = 32
 TabContainer/font_sizes/font_size = 32
+TabContainer/styles/tabbar_background = ExtResource("8_l6mbx")
 TextEdit/font_sizes/font_size = 32