I would like to have [this list](http://getbootstrap.com/components/#list-group-basic) horizontally.

With **list-inline**, I get the list to be horizontal, but it doesn't style the `<li>`. I would like then to add a class on the `li` elements but don't know in what place of the code I can add style. 

```
<ul class="list-inline">
      <?php
        $cat_args['title_li'] = '';
        wp_list_categories(apply_filters('', $cat_args));?>
</ul>

```