diff --git a/Sources/TUIKit/App/App.swift b/Sources/TUIKit/App/App.swift
index 7859408..31508d2 100644
--- a/Sources/TUIKit/App/App.swift
+++ b/Sources/TUIKit/App/App.swift
@@ -472,8 +472,6 @@ internal final class AppRunner<A: App> {
     }
 
     private func render() {
-        terminal.clear()
-
         // Clear event handlers before re-rendering
         KeyEventDispatcher.shared.clearHandlers()
         focusManager.clear()
@@ -501,6 +499,9 @@ internal final class AppRunner<A: App> {
 
         // Update global environment storage
         EnvironmentStorage.shared.environment = environment
+        
+        // Fill the entire screen with the theme background color
+        terminal.fillBackground(themeManager.currentTheme.background)
 
         // Render main content
         let scene = app.body
diff --git a/Sources/TUIKit/Rendering/ANSIRenderer.swift b/Sources/TUIKit/Rendering/ANSIRenderer.swift
index 271b307..b2b0a38 100644
--- a/Sources/TUIKit/Rendering/ANSIRenderer.swift
+++ b/Sources/TUIKit/Rendering/ANSIRenderer.swift
@@ -116,6 +116,17 @@ public enum ANSIRenderer {
             return ["48", "2", "\(red)", "\(green)", "\(blue)"]
         }
     }
+    
+    /// Generates the ANSI escape sequence for a background color.
+    ///
+    /// Use this to set only the background color without other styles.
+    ///
+    /// - Parameter color: The background color.
+    /// - Returns: The ANSI escape sequence.
+    public static func backgroundCode(for color: Color) -> String {
+        let codes = backgroundCodes(for: color)
+        return "\(csi)\(codes.joined(separator: ";"))m"
+    }
 
     // MARK: - Cursor Control
 
diff --git a/Sources/TUIKit/Rendering/Terminal.swift b/Sources/TUIKit/Rendering/Terminal.swift
index 00f8039..6c6fb81 100644
--- a/Sources/TUIKit/Rendering/Terminal.swift
+++ b/Sources/TUIKit/Rendering/Terminal.swift
@@ -152,6 +152,30 @@ public final class Terminal: @unchecked Sendable {
     public func clear() {
         write(ANSIRenderer.clearScreen + ANSIRenderer.moveCursor(toRow: 1, column: 1))
     }
+    
+    /// Fills the entire screen with a background color.
+    ///
+    /// This clears the screen and fills every cell with the specified color.
+    /// Use this to set a consistent background before rendering content.
+    ///
+    /// - Parameter color: The background color to fill.
+    public func fillBackground(_ color: Color) {
+        let size = getSize()
+        let bgCode = ANSIRenderer.backgroundCode(for: color)
+        let reset = ANSIRenderer.reset
+        
+        // Move to top-left and fill each line
+        var output = ANSIRenderer.moveCursor(toRow: 1, column: 1)
+        let emptyLine = bgCode + String(repeating: " ", count: size.width) + reset
+        
+        for _ in 0..<size.height {
+            output += emptyLine
+        }
+        
+        // Move cursor back to top-left
+        output += ANSIRenderer.moveCursor(toRow: 1, column: 1)
+        write(output)
+    }
 
     /// Moves the cursor to the specified position.
     ///
diff --git a/Sources/TUIKitExample/ContentView.swift b/Sources/TUIKitExample/ContentView.swift
index e02411b..6f766eb 100644
--- a/Sources/TUIKitExample/ContentView.swift
+++ b/Sources/TUIKitExample/ContentView.swift
@@ -18,10 +18,9 @@ struct ContentView: View {
     var body: some View {
         let state = ExampleAppState.shared
 
-        // Show current page based on state with theme background
+        // Show current page based on state
+        // Note: Background color is set by AppRunner using theme.background
         pageContent(for: state.currentPage)
-            .frame(maxWidth: .infinity, maxHeight: .infinity)
-            .background(Color.theme.background)
             .onKeyPress { event in
                 switch event.key {
                 case .escape: