Refactor box-shadow style for sidebar to satisfy css lint
Refactor box-shadow style for sidebar to satisfy css lint

Signed-off-by: Dmitriy Zaporozhets <be23d75b156792e5acab51b196a2deb155d35d6a@gmail.com>

LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,martijnvermaat/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,shinexiao/gitlabhq,daiyu/gitlab-zh,icedwater/gitlabhq,mmkassem/gitlabhq,mr-dxdy/gitlabhq,mr-dxdy/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dreampet/gitlab,iiet/iiet-git,dplarson/gitlabhq,SVArago/gitlabhq,htve/GitlabForChinese,darkrasid/gitlabhq,screenpages/gitlabhq,shinexiao/gitlabhq,daiyu/gitlab-zh,martijnvermaat/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,LUMC/gitlabhq,martijnvermaat/gitlabhq,LUMC/gitlabhq,allysonbarros/gitlabhq,SVArago/gitlabhq,htve/GitlabForChinese,mr-dxdy/gitlabhq,screenpages/gitlabhq,t-zuehlsdorff/gitlabhq,shinexiao/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,openwide-java/gitlabhq,martijnvermaat/gitlabhq,jirutka/gitlabhq,daiyu/gitlab-zh,darkrasid/gitlabhq,darkrasid/gitlabhq,icedwater/gitlabhq,t-zuehlsdorff/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,allysonbarros/gitlabhq,mr-dxdy/gitlabhq,jirutka/gitlabhq,screenpages/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,darkrasid/gitlabhq,SVArago/gitlabhq,allysonbarros/gitlabhq,allysonbarros/gitlabhq,SVArago/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,shinexiao/gitlabhq,LUMC/gitlabhq,dreampet/gitlab,openwide-java/gitlabhq,icedwater/gitlabhq,screenpages/gitlabhq,dplarson/gitlabhq,daiyu/gitlab-zh,icedwater/gitlabhq,iiet/iiet-git