<ul class="prev-next">
<?php
$prev_post = get_previous_post();
if (!empty( $prev_post )): ?>
<li class="prev-next__prev">
<a href="<?php echo get_permalink( $prev_post->ID ); ?>">
<span><?php _e('Previous post','eukleia'); ?></span>
<?php echo $prev_post->post_title; ?>
</a>
</li>
<?php endif; ?>
<?php
$next_post = get_next_post();
if (!empty( $next_post )): ?>
<li class="prev-next__next">
<a href="<?php echo get_permalink( $next_post->ID ); ?>">
<span><?php _e('Next post','Eukleia'); ?></span>
<?php echo $next_post->post_title; ?>
</a>
</li>
<?php endif; ?>
</ul>
<!-- prev-next -->