Sharepoint 2013 master page navigation

https://sharepoint.rackspace.com/branding-top-navigation-in-sharepoint-2013

https://chrisstahl.wordpress.com/2014/03/31/customizing-sharepoint-2013-global-navigation-with-css-and-jquery-part-5/


https://chrisstahl.wordpress.com/2013/11/30/customizing-sharepoint-2013-global-navigation-with-css-and-jquery-part-1/

http://www.sharepointdiary.com/2013/04/branding-sharepoint-2010-top-navigation-menubar.html

http://www.sharepointdiary.com/2014/11/sharepoint-2013-top-navigation-bar-branding-css.html