I have this code

use winit::{
    dpi::LogicalSize,
    event::*, 
    event_loop::EventLoop, 
    keyboard::{KeyCode, PhysicalKey}, 
    window::{Window, WindowBuilder}
};

fn window_setup(event_loop: &EventLoop<()>) -> Window {
    let window = WindowBuilder::new()
        .with_title("Motion Sketch")
        .with_decorations(false)
        .with_inner_size(LogicalSize::new(1280, 720))
        .build(&event_loop)
        .unwrap();

    let outer_size = window.outer_size();
    window.set_min_inner_size(Some(outer_size));
    window.set_max_inner_size(Some(outer_size));

    window
}

pub fn run() {
    env_logger::init();
    let event_loop = EventLoop::new().unwrap();
    let window = window_setup(&event_loop);
    
    println!("Inner size: {:?}", window.inner_size()); // Inner size: PhysicalSize { width: 1600, height: 900 }
    println!("Outer size: {:?}", window.outer_size()); // Outer size: PhysicalSize { width: 1600, height: 900 }


    let _ = event_loop.run(move |event, control_flow| match event {
        Event::WindowEvent {
            ref event,
            window_id,
        } if window_id == window.id() => match event {
            WindowEvent::CloseRequested
            | WindowEvent::KeyboardInput {
                event:
                    KeyEvent {
                        state: ElementState::Pressed,
                        physical_key: PhysicalKey::Code(KeyCode::Escape),
                        ..
                    },
                ..
            } => control_flow.exit(),
            _ => {}
        },
        _ => {}
    });
}

 

In function window_setup() I set the content area dimention to windows dimention, however the white area(content area) does not cover the whole window like i expected. What did I do wrong?

the image of window:
enter image description here