Change font size in widget

This is a great plugin thank you it works brilliantly however I would like to style it separately to the other widgets on the page:
I would like each list item of the Categories widget (AVH Extended) to fit on one line on the page.
Is this possible?
e.g. displayed as:
BRANDING PORTRAITS BLOG
VIDEO BRAND MARKETING
EVENTS

https://wordpress.org/plugins/extended-categories-widget/