diff --git a/apps/multi.c b/apps/multi.c
index f7c55bb..eda1425 100644
--- a/apps/multi.c
+++ b/apps/multi.c
@@ -304,15 +304,17 @@ static void apps_blur(twin_screen_t *screen, int x, int y, int w, int h)
     twin_composite(scaled_background, 0, 0, &srcop, 0, 0, 0, 0, 0, TWIN_SOURCE,
                    scaled_background->width, scaled_background->height);
 
-    /* Apply blur effect to the scaled background */
-    twin_stack_blur(scaled_background, 16, 0, scaled_background->width - 1, 0,
+    /*
+     * Apply blur effect to the scaled background. The valid kernel size range
+     * is from 1 to 15.
+     */
+    twin_stack_blur(scaled_background, 15, 0, scaled_background->width - 1, 0,
                     scaled_background->height - 1);
 
     /* Copy the blurred background to the window */
     srcop.u.pixmap = scaled_background;
-    twin_composite(window->pixmap, window->client.left, window->client.top,
-                   &srcop, 0, 0, NULL, 0, 0, TWIN_SOURCE, client_width,
-                   client_height);
+    twin_composite(window->pixmap, 0, 0, &srcop, 0, 0, NULL, 0, 0, TWIN_SOURCE,
+                   client_width, client_height);
 
     twin_pixmap_destroy(scaled_background);
     twin_pixmap_destroy(raw_background);
diff --git a/configs/Kconfig b/configs/Kconfig
index c8c49b3..4a667c7 100644
--- a/configs/Kconfig
+++ b/configs/Kconfig
@@ -74,7 +74,7 @@ config VERTICAL_OFFSET
 config SHADOW_BLUR
     int "Shadow blur radius"
     default 10
-    range 1 10
+    range 1 15
     depends on DROP_SHADOW
 
 endmenu