How to make 2 buttons out of those options "previous" and "next" ?

single-post.php

<?php
										wp_link_pages( array(
											'before' => '<div class="page-links"><center><p id="post-navigator">' . esc_html__( '', 'extra' ),
											'after'  => '</p></center></div>',
											'next_or_number'=>'next',
											'previouspagelink'=>'&laquo; P&aacute;gina anterior',
											'nextpagelink'=>'Continuar lendo &raquo;',
										) );
									?>