diff --git a/src/cascadia/TerminalApp/App.xaml b/src/cascadia/TerminalApp/App.xaml
index 7dabb689a3c..01b315644cc 100644
--- a/src/cascadia/TerminalApp/App.xaml
+++ b/src/cascadia/TerminalApp/App.xaml
@@ -149,7 +149,7 @@
                                 See GH #12356 for more history on the subject.
                             -->
                             <SolidColorBrush x:Key="TabViewBackground"
-                                             Color="#0a0a0a" />
+                                             Color="#2e2e2e" />
 
                             <StaticResource x:Key="UnfocusedBorderBrush"
                                             ResourceKey="ApplicationPageBackgroundThemeBrush" />
@@ -165,7 +165,7 @@
                                 GH #12398 has more history on this value, as well as GH #12400
                             -->
                             <SolidColorBrush x:Key="TabViewBackground"
-                                             Color="#dadada" />
+                                             Color="#e8e8e8" />
 
                             <StaticResource x:Key="UnfocusedBorderBrush"
                                             ResourceKey="ApplicationPageBackgroundThemeBrush" />
diff --git a/src/cascadia/TerminalSettingsModel/defaults.json b/src/cascadia/TerminalSettingsModel/defaults.json
index 02e07a223c3..117248e4d7c 100644
--- a/src/cascadia/TerminalSettingsModel/defaults.json
+++ b/src/cascadia/TerminalSettingsModel/defaults.json
@@ -26,7 +26,7 @@
     // Miscellaneous
     "confirmCloseAllTabs": true,
     "startOnUserLogin": false,
-    "theme": "system",
+    "theme": "dark",
     "snapToGridOnResize": true,
     "disableAnimations": false,
     "startupActions": "",
@@ -283,20 +283,38 @@
     "themes": [
         {
             "name": "light",
-            "window":{
+            "window": {
                 "applicationTheme": "light"
+            },
+            "tab": {
+                "background": "terminalBackground",
+                "unfocusedBackground": "#00000000"
+            },
+            "tabRow": {
+                "unfocusedBackground": "#FFFFFFFF"
             }
         },
         {
             "name": "dark",
-            "window":{
+            "window": {
                 "applicationTheme": "dark"
+            },
+            "tab": {
+                "background": "terminalBackground",
+                "unfocusedBackground": "#00000000"
+            },
+            "tabRow": {
+                "unfocusedBackground": "#333333FF"
             }
         },
         {
             "name": "system",
-            "window":{
+            "window": {
                 "applicationTheme": "system"
+            },
+            "tab": {
+                "background": "terminalBackground",
+                "unfocusedBackground": "#00000000"
             }
         }
     ],