diff --git a/_share/media/img/albert/section04/lesson-01/fig05.png b/_share/media/img/albert/section04/lesson-01/fig05.png
new file mode 100644
index 0000000..87f4605
Binary files /dev/null and b/_share/media/img/albert/section04/lesson-01/fig05.png differ
diff --git a/_subsections/sec04/lesson-01.org b/_subsections/sec04/lesson-01.org
index 1ca5f41..1b2c367 100644
--- a/_subsections/sec04/lesson-01.org
+++ b/_subsections/sec04/lesson-01.org
@@ -39,3 +39,17 @@ there are two ways to do this
 
         #+attr_html: :width 700px
         [[./../../_share/media/img/albert/section04/lesson-01/fig04.png]]
+
+** set up aspect ratio
+*** set the values
+- Project->Project Settings
+- Display->Window
+- In 'Size'
+  - set width 480
+  - set height to 854
+
+*** viewport changes
+- the white line representing the viewport changes shape
+- move the background image appropriately with the view tool
+   #+attr_html: :width 600px
+   [[./../../_share/media/img/albert/section04/lesson-01/fig05.png]]