Simplify box-shadow css
Simplify box-shadow css

This commit will remove unneccessary vendor prefixes and simplify rgba color to hex.

RafaelPalomar/girder,jbeezley/girder,Xarthisius/girder,data-exp-lab/girder,girder/girder,RafaelPalomar/girder,Xarthisius/girder,girder/girder,Xarthisius/girder,jbeezley/girder,RafaelPalomar/girder,RafaelPalomar/girder,Xarthisius/girder,Kitware/girder,data-exp-lab/girder,Kitware/girder,kotfic/girder,kotfic/girder,data-exp-lab/girder,data-exp-lab/girder,manthey/girder,Xarthisius/girder,manthey/girder,Kitware/girder,RafaelPalomar/girder,manthey/girder,girder/girder,jbeezley/girder,kotfic/girder,jbeezley/girder,Kitware/girder,data-exp-lab/girder,kotfic/girder,manthey/girder,girder/girder,kotfic/girder