diff --git a/src/main.rs b/src/main.rs
index 9364d99..4b2a756 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,6 +17,7 @@ fn main() {
             Material2dPlugin::<CustomMaterial>::default(),
         ))
         .add_systems(Startup, setup)
+        .add_systems(Update, resize_fullscreen_quad)
         .run();
 }
 
@@ -40,9 +41,26 @@ fn setup(
         Mesh2d(meshes.add(Rectangle::default())),
         MeshMaterial2d(materials.add(CustomMaterial {})),
         Transform::from_scale(Vec3::new(size.x, size.y, 1.0)),
+        FullscreenQuad,
     ));
 }
 
+/// Marker component for the fullscreen quad so we can update it on window resize
+#[derive(Component)]
+struct FullscreenQuad;
+
+/// Update fullscreen quad transforms when the primary window is resized.
+fn resize_fullscreen_quad(
+    primary_window: Single<&Window, With<PrimaryWindow>>,
+    mut transform: Single<&mut Transform, With<FullscreenQuad>>,
+) {
+    let size = Vec2::new(
+        primary_window.resolution.width(),
+        primary_window.resolution.height(),
+    );
+    transform.scale = Vec3::new(size.x, size.y, 1.0);
+}
+
 // This is the struct that will be passed to your shader
 #[derive(Asset, TypePath, AsBindGroup, Clone)]
 struct CustomMaterial {}