CRw: Focus when tabbing with keyboard is not strong enough

[bit-pro-iew-eui]

This is the good example (*):

Contrast is not sufficient, like:

==> set border like in good example (*)

==> set border like in good example (*)

==> set border like in good example (*)

==> set border like in good example (*)

==> set border like in good example (*)

==> Use underline for keyboard focus

==> Use underline for keyboard focus

==> Use underline for keyboard focus

Links in paragraphs: there is no difference with keyboard tabbing.
==> Change the color to red and set to no underline

Focus is still not strong enough, when using the tabbing (keyboard), see #254