Fix .btn color and refine to match style of .btn-outline
Fix .btn color and refine to match style of .btn-outline

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