add img-shadow style for images
add img-shadow style for images

cyrusin/jacman,vitaminabcd/jacman,CoderRobin/blogtheme,stableShip/jacman,PhiloSky/jacman,gqzydh/jacman,pengshp/jacman,hunterzhang86/hunter,ChenXiyu/jacman,lifei/jacman,wuchong/jacman,mutse/jacman,jiyiren/jacman,gaotao1989/jacman,Refarin/jacman,zhiyue/jacman,IceHe/blog_theme_jacman,wuchong/jacman,lichenbuliren/jacman,ibrother/jacman,IceHe/jacman,ningjiang/jacman,dzcq/jacman