Thoughts on adding a border to the bottom of the dropdown menu on mobile? <img width="557" alt="Screen Shot 2020-05-22 at 11 05 40 PM" src="https://user-images.githubusercontent.com/14525856/82720352-cdc1d280-9c80-11ea-8847-73b1b5801d9a.png"> **vs** <img width="557" alt="Screen Shot 2020-05-22 at 11 05 40 PM" src="https://user-images.githubusercontent.com/14525856/82720434-a4557680-9c81-11ea-8283-6e590f1f2763.png">
