This members-only tutorial improves upon the earlier one and provides the steps to display links to previous and next posts (image and title) as sticky tabs along the edges of the browser that slide open on hover in Oxygen.
From 1200px and below, the adjacent post navigation will appear below the post.
From 768px and below, the adjacent posts will appear one below the other.
We are going to load and use Dashicons for the arrows.
For posts that do not have a featured image, we shall show a default placeholder image.
Let's add a custom image size for the adjacent post's featured images.