Add shadow class for images.
Add shadow class for images.

Provides a nice shadow/border for mostly white images, like screen shots.

Spondool/spondool-blog,lwe-blog/lwe-blog.github.io,Spondool/spondool-blog,lwe-blog/lwe-blog.github.io,Spondool/spondool-blog,lwe-blog/lwe-blog.github.io