How Do I Make a Mobile Drop down list of this

A wordpress website with a custom theme I need to be able to take a section that is populated by a bucket, carousel, and staff and make an additional view for mobile where the staff shows in a drop down menu. On desktop view the staff shows all staff members in three columns across the page, click on one staff member and their information shows at bottom (also, need to know how to add scroll when you click the staff member) on mobile that will be gone and it will just be a drop down menu will staff members and when one is selected information will show at bottom. Look at the page and please give any help Look at the Team Section