A views & CSS only solution for a previous post & next post buttons in a blog-node?
This you can do easily with the Core Book module. As you can see on the any Drupal.org page for example, Drupal.org page.


  


Using Book module


You can create a Book which is like index and add the nodes in-order you want, and it will show Next and Prev as shown in above page as title of that node.


D8 site scree shot:

Configuration page


  


Example Page: