added hover shadow to dropdown
added hover shadow to dropdown

using only fadeout generates a weird repeating decimal. not sure what
the cause is (LESS bug?) but fading it out 100% and then back in by the
percentage i want works just fine.

prathamesh-sonpatki/frontend,circleci/frontend,RayRutjes/frontend,prathamesh-sonpatki/frontend,circleci/frontend,RayRutjes/frontend,circleci/frontend