Different Output

This is the code:

<link href=”<?php bloginfo(‘stylesheet_url’); ?>” rel=”stylesheet” type=”text/css” media=”screen” />

Strange, it looks invisible to:

Extra Page in wordpress that uses extra side navigation

Well, in my localhost I can see something, except that the css seems to be disabled.

Well it looks invisible online:

Extra Page in wordpress that uses extra side navigation

and visible in localhost except that the css seems to be disactivated.
I wonder if it is outside wordpress scope since I am creating my own page outside of the top navigation ?

See, I can see: The about page clearly. (connected to css)