remove z-index. it causes a problem where the track click target improperly appears over other page elements, and is unnecessary.
remove z-index. it causes a problem where the track click target improperly appears over other page elements, and is unnecessary.

ihmeuw/ihme-ui,ihmeuw/ihme-ui,ihmeuw/beaut,ihmeuw/ihme-ui,ihmeuw/beaut,ihmeuw/beaut