What I did was the following:
- Look in index.php for the name of the function that creates the older/newer posts links.
- Search (using the multifile search function of my text editor) for where that function is defined.
- Open that file and copy the HTML code from there to index.php, replacing the function call.
- Save index.php (but not close the file).
- Style the links.
- Replace the faux HTML code with the original function code again in index.php (since I left the file open in my text editor I only had to click “Undo” once and then save).
- Done.
Took me a few minutes.