Padding and Navigation Options

I needed to add to the CSS Code for Links: padding-top: 16px; but the plugin is unresponsive to this typical string? We need a white space above the text and arrow, where it has little padding.

Additionally, I notice the navigation does not work by date order? Looking at a current post, the past post shown will skip over 4 other posts, in date order. The plugin should afford the option for the user to select next post by date order or next post by category order.

https://ww.wp.xz.cn/plugins/wp-post-navigation/