Magenta Smart Guides will appear when it’s aligned in the center of the half-ellipse.
Change the fill color to a darker brown and the stroke color to a lighter brown in the Properties
panel.
Drag the top-middle point of the ellipse down. As you drag, press the Option (macOS) or Alt
(Windows) key to resize both sides at the same time. When you see a height of 0.1 inches,
release the mouse button and then the key.
Click the word “Stroke” in the Properties panel to open the Stroke panel. In the Stroke panel,
change the stroke weight of the selected rectangle to 2. Click the Align Stroke To Inside button