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Navigation Next and previous page inside a button, how to do it in wordpress?

Simon

already searched, I tried everything but it didn't work. How do I include the function next page, or previous page in a button with image in wordpress?

like the picture below? no text, or title, just the image. enter image description here

I tried several ways, merging "<?php previous_post_link(); ?> <?php next_post_link(); ?>" with "<a class="icon-container" href="#">"

Thanks