adding additional CSS for main navigation

I have a custom website theme which the customer likes a lot. I have added the dynamic call for navigation; I have used the <?php wp_nav_menu( array(‘theme_location’ => ‘header-menu’));?> and I have added container_class and container_id to add more objectives to the array to the specific class and id. I have put the functions.php registering the header-menu. The menu appears in the appearance to change and alter, so the functions.php is working but in the server view the page still displays in block with bullets.<link rel=”stylesheet” type=”text/css” href”<?php bloginfo(‘template_url’);?>/css/custom.css”> to bring in the css file. along with the static css sheet to view in html. I have gone through all the different discussion, I would rather have this css file separate from the style.css. On the other hand I have copied and pasted the code into the css file and this did not work either. Any help would be appreciated.