<nav class="pagination" role="navigation"><?php if( get_previous_posts_link() ) { ?><div id="prv" class="button pag-btn nav-next"><?php previous_posts_link( 'Previous' ); ?></div><?php } if( get_next_posts_link() ) { ?><div id="nxt" class="button pag-btn nav-previous"><?php next_posts_link( 'Next' ); ?></div><?php } ?></nav>https://developer.wordpress.org/reference/functions/previous_posts_link/https://developer.wordpress.org/reference/functions/get_previous_posts_link/