Styling 'Add a Comment' link & comment-link

I like the theme satorii, but I don’t like all that metadata that is bolted onto the side of each post – so in the css I added
.entry-meta,.page-meta{display:none;}
Now I would like to add comment info below the title and an ‘Add a Comment’ link at the end of each post. I’ve done that with

<p>
<?php
  comments_popup_link( 'No comments yet', '1 comment', '% comments', 'comments-link', 'Comments are off for this post');
?>
</p>

and

<?php comments_template() ?>
<a href="<?php comments_link(); ?>">
    Add a comment
</a>

in the index.php.
I’m trying to centre them (and perhaps do a bit more styling) but I’m really struggling to select them in my stylesheet. What am I doing wrong?
My website is https://jakebeamish.co.uk