Add Category Bar on Top

So I want to add a category bar on top of my webiste below the breadcrumbs, I added the below code to virtual header.php

<div id="munchycat" class="col12">
<li class="page_item">"
<?php wp_list_pages('depth=1&title_li='); ?>
<?php wp_list_categories('title_li='); ?>
</div>

problem - title_li=' which ensures that the word Categories is not displayed before the list is not working?