Header background enhancement
Header background enhancement

Signed-off-by: Daniel Valencia <8e1350bdea077c2803395f0a6abf16e5b3ac6bfd@gmail.com>

juanchopx2/calidev.github.io,juanchopx2/calidev.github.io,calidev/calidev.github.io,andresgz/calidev.github.io,calidev/calidev.github.io,andresgz/calidev.github.io,juanchopx2/calidev.github.io,andresgz/calidev.github.io,calidev/calidev.github.io