How do you change the tag font size in the repeater-template.php [closed]

In the CSS file you can easily add it.

li {
     font-size: 6px;
}

Note: now the font-size of all li elements will be 6px

If you want only the tags li to be that size it’s better to give them a class.

<?php the_tags('<li class="tags">', '</li><li class="tags">', '</li>'); ?>

and the CSS:

li.tags {
     font-size: 6px;
}