diff --git a/agentydragon/README.md b/agentydragon/README.md
index f75221ef47..1a0afefde7 100644
--- a/agentydragon/README.md
+++ b/agentydragon/README.md
@@ -43,6 +43,10 @@ This file documents the changes introduced on the `agentydragon` branch
   - Updated Markdown rendering in chat UI and logs to honor compact mode globally (diffs, docs, help messages).
   - Added unit tests covering H1–H6 heading spacing for both compact and default modes.
 
+## codex-rs/tui: opaque approval dialog background
+- Filled the approval dialog area with a DarkGray background to block underlying prompt text.
+- Added a unit test in `tui/src/user_approval_widget.rs` to assert no transparent or sentinel background remains in the dialog region.
+
 ## Documentation tasks
 
 Tasks live under `agentydragon/tasks/` as individual Markdown files. Please update each task’s **Status** and **Implementation** sections in place rather than maintaining a static list here.
diff --git a/agentydragon/tasks/38-approval-dialog-transparent-background-fix.md b/agentydragon/tasks/38-approval-dialog-transparent-background-fix.md
index 784452b2c7..fb684b3ed6 100644
--- a/agentydragon/tasks/38-approval-dialog-transparent-background-fix.md
+++ b/agentydragon/tasks/38-approval-dialog-transparent-background-fix.md
@@ -1,18 +1,18 @@
 +++
 id = "38"
 title = "Fix Approval Dialog Transparent Background"
-status = "Not started"
+status = "Done"
 dependencies = ""
 summary = "The approval dialog background is transparent, causing prompt text underneath to overlap and become unreadable."
-last_updated = "2025-06-25T00:00:00Z"
+last_updated = "2025-06-25T23:00:00.000000"
 +++
 
 > *UI bug:* When the approval dialog appears, its background is transparent and any partially entered prompt text shows through, overlapping and confusing the dialog.
 
 ## Status
 
-**General Status**: Not started  
-**Summary**: Identify the CSS/ANSI background settings for dialogs and enforce an opaque backdrop before text rendering.
+**General Status**: Done  
+**Summary**: Identify and implement an opaque background for the approval dialog to prevent underlying text bleed-through.
 
 ## Goal
 
@@ -25,8 +25,9 @@ Ensure the approval dialog is drawn with a solid background color (matching the
 
 ## Implementation
 
-- Update dialog background color in TUI rendering code (`.tui` component).
-- Add a test to verify no transparent cells in dialog region.
+- Updated `render_ref` in `codex-rs/tui/src/user_approval_widget.rs` to fill the entire dialog area with a `DarkGray` background before drawing the border and content.
+- Implemented nested loops over the dialog `Rect` calling `buf[(col, row)].set_bg(Color::DarkGray)` on each cell.
+- Added unit test `render_approval_dialog_fills_background` in `tui/src/user_approval_widget.rs` to render the widget onto a buffer pre-filled with a red background and verify no cell in the dialog region remains transparent or retains the sentinel background.
 
 ## Notes
 
diff --git a/codex-rs/tui/src/user_approval_widget.rs b/codex-rs/tui/src/user_approval_widget.rs
index b763199436..90559bd365 100644
--- a/codex-rs/tui/src/user_approval_widget.rs
+++ b/codex-rs/tui/src/user_approval_widget.rs
@@ -406,6 +406,12 @@ impl WidgetRef for &UserApprovalWidget<'_> {
             }
         };
 
+        // Fill the entire dialog area with a solid background to block underlying text.
+        for row in area.y..area.y + area.height {
+            for col in area.x..area.x + area.width {
+                buf[(col, row)].set_bg(Color::DarkGray);
+            }
+        }
         outer.render(area, buf);
         self.confirmation_prompt.clone().render(prompt_chunk, buf);
         Widget::render(List::new(lines), response_chunk, buf);
@@ -417,6 +423,9 @@ mod tests {
     use super::*;
     use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
     use std::sync::mpsc;
+    use ratatui::buffer::{Buffer, Cell};
+    use ratatui::layout::Rect;
+    use ratatui::style::{Color, Style};
 
     #[test]
     fn esc_in_input_mode_cancels_input_and_preserves_value() {
@@ -466,4 +475,45 @@ mod tests {
         assert!(truncated.starts_with("Yes, always allow running `"));
         assert!(truncated.ends_with("` for this session (a)"));
     }
+
+    #[test]
+    fn render_approval_dialog_fills_background() {
+        // Arrange: create a basic Exec approval widget in Select mode.
+        let (tx, _) = mpsc::channel();
+        let app_event_tx = AppEventSender::new(tx);
+        let widget = UserApprovalWidget::new(
+            ApprovalRequest::Exec {
+                id: "id".into(),
+                command: vec!["cmd".into()],
+                cwd: std::env::current_dir().unwrap(),
+                reason: None,
+            },
+            app_event_tx,
+        );
+
+        // Determine dialog area size.
+        let width = 50;
+        let height = widget.get_height(&Rect::new(0, 0, width, u16::MAX));
+        let area = Rect::new(0, 0, width, height);
+
+        // Pre-fill buffer with a sentinel background (red).
+        let mut buf = Buffer::empty(area);
+        for row in area.y..area.y + area.height {
+            for col in area.x..area.x + area.width {
+                buf[(col, row)].set_bg(Color::Red);
+            }
+        }
+
+        // Act: render the widget
+        (&widget).render_ref(area, &mut buf);
+
+        // Assert: no cell in dialog region remains transparent or retains the sentinel background.
+        for row in area.y..area.y + area.height {
+            for col in area.x..area.x + area.width {
+                let cell = buf.cell((col, row)).unwrap();
+                assert_ne!(cell.bg, Color::Reset, "Found transparent cell at ({}, {})", col, row);
+                assert_ne!(cell.bg, Color::Red, "Found unfilled cell at ({}, {})", col, row);
+            }
+        }
+    }
 }