diff --git a/app/src/main/java/com/electricdreams/numo/ModernPOSActivity.kt b/app/src/main/java/com/electricdreams/numo/ModernPOSActivity.kt
index 863137bf..619de345 100644
--- a/app/src/main/java/com/electricdreams/numo/ModernPOSActivity.kt
+++ b/app/src/main/java/com/electricdreams/numo/ModernPOSActivity.kt
@@ -93,19 +93,26 @@ class ModernPOSActivity : AppCompatActivity(), SatocashWallet.OperationFeedback,
         // Use the same resolved background color as ThemeManager so the
         // ModernPOS window background matches the active theme selection
         // (obsidian, green, bitcoin orange, white, etc.). This ensures the
-        // navigation pill always floats above the correct themed background
-        // instead of a hardcoded "green".
+        // navigation bar always matches the current theme.
         val bgColor = com.electricdreams.numo.ui.theme.ThemeManager.resolveBackgroundColor(this)
         window.setBackgroundDrawable(android.graphics.drawable.ColorDrawable(bgColor))
 
-        window.statusBarColor = android.graphics.Color.TRANSPARENT
-        window.navigationBarColor = android.graphics.Color.TRANSPARENT
+        // Set both status bar and navigation bar to match the theme background.
+        // Note: We use the actual color instead of TRANSPARENT because some devices
+        // (like Sunmi POS terminals) don't properly support transparent system bars
+        // and will show a system default color instead.
+        window.statusBarColor = bgColor
+        window.navigationBarColor = bgColor
+
+        // Determine if this is a light theme (white) to set appropriate icon colors
+        val prefs = getSharedPreferences("app_prefs", MODE_PRIVATE)
+        val theme = prefs.getString("app_theme", "green") ?: "green"
+        val isLightTheme = (theme == "white")
 
         WindowInsetsControllerCompat(window, window.decorView).apply {
-            // For the dark themes we keep icons light; for white theme the
-            // ThemeManager will already have set light/dark appropriately.
-            isAppearanceLightStatusBars = false
-            isAppearanceLightNavigationBars = false
+            // Light icons for dark themes, dark icons for white theme
+            isAppearanceLightStatusBars = isLightTheme
+            isAppearanceLightNavigationBars = isLightTheme
         }
 
         ViewCompat.setOnApplyWindowInsetsListener(findViewById(android.R.id.content)) { v, windowInsets ->
diff --git a/app/src/main/java/com/electricdreams/numo/PaymentFailureActivity.kt b/app/src/main/java/com/electricdreams/numo/PaymentFailureActivity.kt
index 4fe6a40f..fe7b0407 100644
--- a/app/src/main/java/com/electricdreams/numo/PaymentFailureActivity.kt
+++ b/app/src/main/java/com/electricdreams/numo/PaymentFailureActivity.kt
@@ -48,8 +48,12 @@ class PaymentFailureActivity : AppCompatActivity() {
 
         // Enable edge-to-edge, mirroring PaymentReceivedActivity
         WindowCompat.setDecorFitsSystemWindows(window, false)
-        window.statusBarColor = android.graphics.Color.TRANSPARENT
-        window.navigationBarColor = android.graphics.Color.TRANSPARENT
+        
+        // Use solid white for both status and navigation bars.
+        // Note: TRANSPARENT doesn't work well on some devices (like Sunmi POS terminals).
+        val bgColor = android.graphics.Color.WHITE
+        window.statusBarColor = bgColor
+        window.navigationBarColor = bgColor
 
         val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
         windowInsetsController.isAppearanceLightStatusBars = true
diff --git a/app/src/main/java/com/electricdreams/numo/PaymentReceivedActivity.kt b/app/src/main/java/com/electricdreams/numo/PaymentReceivedActivity.kt
index 7d2c91f8..7ea9c9a0 100644
--- a/app/src/main/java/com/electricdreams/numo/PaymentReceivedActivity.kt
+++ b/app/src/main/java/com/electricdreams/numo/PaymentReceivedActivity.kt
@@ -49,8 +49,12 @@ class PaymentReceivedActivity : AppCompatActivity() {
         
         // Enable edge-to-edge
         WindowCompat.setDecorFitsSystemWindows(window, false)
-        window.statusBarColor = android.graphics.Color.TRANSPARENT
-        window.navigationBarColor = android.graphics.Color.TRANSPARENT
+        
+        // Use solid white for both status and navigation bars.
+        // Note: TRANSPARENT doesn't work well on some devices (like Sunmi POS terminals).
+        val bgColor = android.graphics.Color.WHITE
+        window.statusBarColor = bgColor
+        window.navigationBarColor = bgColor
         
         // Set light status bar icons (since background is white)
         val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
diff --git a/app/src/main/java/com/electricdreams/numo/feature/MultiInsetEdgeToEdge.kt b/app/src/main/java/com/electricdreams/numo/feature/MultiInsetEdgeToEdge.kt
index 5f34d796..25ea749c 100644
--- a/app/src/main/java/com/electricdreams/numo/feature/MultiInsetEdgeToEdge.kt
+++ b/app/src/main/java/com/electricdreams/numo/feature/MultiInsetEdgeToEdge.kt
@@ -15,13 +15,23 @@ import androidx.core.view.WindowInsetsControllerCompat
  * Usage from an Activity:
  *
  *     enableEdgeToEdgeWithPill(this)
+ *     enableEdgeToEdgeWithPill(this, backgroundColor = Color.WHITE)
+ *
+ * @param backgroundColor The background color to use for status and navigation bars.
+ *                        Defaults to WHITE. Note: We use solid colors instead of TRANSPARENT
+ *                        because some devices (like Sunmi POS terminals) don't properly
+ *                        support transparent system bars.
  */
-fun enableEdgeToEdgeWithPill(activity: Activity, lightNavIcons: Boolean = true) {
+fun enableEdgeToEdgeWithPill(
+    activity: Activity,
+    lightNavIcons: Boolean = true,
+    backgroundColor: Int = Color.WHITE
+) {
     val window = activity.window
 
     WindowCompat.setDecorFitsSystemWindows(window, false)
-    window.statusBarColor = Color.TRANSPARENT
-    window.navigationBarColor = Color.TRANSPARENT
+    window.statusBarColor = backgroundColor
+    window.navigationBarColor = backgroundColor
 
     val controller = WindowInsetsControllerCompat(window, window.decorView)
     controller.isAppearanceLightStatusBars = lightNavIcons
diff --git a/app/src/main/java/com/electricdreams/numo/feature/settings/WithdrawSuccessActivity.kt b/app/src/main/java/com/electricdreams/numo/feature/settings/WithdrawSuccessActivity.kt
index c7fdebb6..4d38423d 100644
--- a/app/src/main/java/com/electricdreams/numo/feature/settings/WithdrawSuccessActivity.kt
+++ b/app/src/main/java/com/electricdreams/numo/feature/settings/WithdrawSuccessActivity.kt
@@ -32,8 +32,12 @@ class WithdrawSuccessActivity : AppCompatActivity() {
 
         // Enable edge-to-edge
         WindowCompat.setDecorFitsSystemWindows(window, false)
-        window.statusBarColor = android.graphics.Color.TRANSPARENT
-        window.navigationBarColor = android.graphics.Color.TRANSPARENT
+        
+        // Use solid white for both status and navigation bars.
+        // Note: TRANSPARENT doesn't work well on some devices (like Sunmi POS terminals).
+        val bgColor = android.graphics.Color.WHITE
+        window.statusBarColor = bgColor
+        window.navigationBarColor = bgColor
 
         // Set light status bar icons (since background is white)
         val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
diff --git a/app/src/main/java/com/electricdreams/numo/feature/tips/TipSelectionActivity.kt b/app/src/main/java/com/electricdreams/numo/feature/tips/TipSelectionActivity.kt
index 72bf81f3..1487fa39 100644
--- a/app/src/main/java/com/electricdreams/numo/feature/tips/TipSelectionActivity.kt
+++ b/app/src/main/java/com/electricdreams/numo/feature/tips/TipSelectionActivity.kt
@@ -104,8 +104,12 @@ class TipSelectionActivity : AppCompatActivity() {
 
     private fun setupWindowSettings() {
         WindowCompat.setDecorFitsSystemWindows(window, false)
-        window.statusBarColor = Color.TRANSPARENT
-        window.navigationBarColor = Color.TRANSPARENT
+        
+        // Use solid white for both status and navigation bars.
+        // Note: TRANSPARENT doesn't work well on some devices (like Sunmi POS terminals).
+        val bgColor = Color.WHITE
+        window.statusBarColor = bgColor
+        window.navigationBarColor = bgColor
 
         // Light status bar (dark icons) since we have white background
         WindowInsetsControllerCompat(window, window.decorView).apply {
diff --git a/app/src/main/java/com/electricdreams/numo/ui/theme/ThemeManager.kt b/app/src/main/java/com/electricdreams/numo/ui/theme/ThemeManager.kt
index 950d1608..102d9774 100644
--- a/app/src/main/java/com/electricdreams/numo/ui/theme/ThemeManager.kt
+++ b/app/src/main/java/com/electricdreams/numo/ui/theme/ThemeManager.kt
@@ -74,10 +74,11 @@ class ThemeManager(
         // Update status bar and navigation bar colors
         activity.window.statusBarColor = backgroundColor
 
-        // Let the system navigation bar be fully transparent so the gesture pill
-        // floats above whatever content/background we're drawing, instead of
-        // sitting on a solid-colored nav bar.
-        activity.window.navigationBarColor = android.graphics.Color.TRANSPARENT
+        // Set navigation bar to match the theme background color.
+        // Note: We use the actual color instead of TRANSPARENT because some devices
+        // (like Sunmi POS terminals) don't properly support transparent navigation
+        // bars and will show a system default color instead.
+        activity.window.navigationBarColor = backgroundColor
         
         // Update status bar appearance based on theme
         val windowInsetsController = WindowInsetsControllerCompat(activity.window, activity.window.decorView)
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index 30d64440..b4d50f96 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -13,9 +13,9 @@
         <!-- Status bar color - matches window background for seamless edge-to-edge -->
         <item name="android:statusBarColor">@color/dark_windowBackground</item>
         <item name="android:windowLightStatusBar">false</item>
-        <!-- Navigation bar: transparent so gesture pill truly floats over content/background -->
-        <!-- Content views should handle bottom insets where needed. -->
-        <item name="android:navigationBarColor">@android:color/transparent</item>
+        <!-- Navigation bar: use solid color to match window background.
+             Note: Transparent doesn't work well on some devices (like Sunmi POS terminals). -->
+        <item name="android:navigationBarColor">@color/dark_windowBackground</item>
         <item name="android:windowLightNavigationBar">false</item>
         <!-- Text colors -->
         <item name="android:textColor">@color/dark_textColorPrimary</item>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 5b101544..643c5cee 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -13,9 +13,9 @@
         <!-- Status bar color - matches window background for seamless edge-to-edge -->
         <item name="android:statusBarColor">@color/color_bg_white</item>
         <item name="android:windowLightStatusBar">true</item>
-        <!-- Navigation bar: transparent so gesture pill truly floats over content/background -->
-        <!-- Content views should handle bottom insets where needed. -->
-        <item name="android:navigationBarColor">@android:color/transparent</item>
+        <!-- Navigation bar: use solid color to match window background.
+             Note: Transparent doesn't work well on some devices (like Sunmi POS terminals). -->
+        <item name="android:navigationBarColor">@color/color_bg_white</item>
         <item name="android:windowLightNavigationBar">true</item>
         <!-- Text colors -->
         <item name="android:textColor">@color/color_text_primary</item>