Change the Margin. Instead of positioning, you could just rely on a negative margin for the second element. This affects the flow of content. margin-top: -2em will move an element two em higher, and enable it to overlap another element.
Ankle-foot orthosis: A brace, usually made of plastic, that is worn on the lower leg and foot to support the ankle, hold the foot and ankle in the correct position and correct foot drop. Abbreviated AFO. Also known as foot drop brace.
They are also used to immobilize the ankle and lower leg in the presence of arthritis or fracture, and to correct foot drop; an AFO is also known as a foot-drop brace. Ankle-foot orthoses are the most commonly used orthoses, making up about 26% of all orthoses provided in the United States.