Plugin adds next & prev nav links on single posts to have a "browse post by post nav style". Includes customizeable parameters.
define( 'WPSPN_REVERSE_LINK_DIRECTION', TRUE );to your theme/ child theme to achieve this!)
wpspn-styles.cssis found in your active theme's/child theme's root folder, this will be the used stylesheet - if it's not there, the packaged plugin stylesheet is being used! This is really handy, if you need to enqueue your own stylesheet and nothing else (i.e. for Multisite purposes...). All update-secure and really easy to handle!
wpspn-additions.cssis found in your active theme's/child theme's root folder it will be added after the plugin's default. This way you can add some more rules or override existing selectors/rules. Again, all update-secure and really easy to handle!