h3.wp-showdown-title

Hi, I have recently purchased V1.6.
I’ve been searching and searching for a way to modify the font size of the competitor titles found above the showdown images and the titles of the images above the winners.
They appear to be the same in font size.
I’ve spent so much time trying to figure this out.
firebug is telling me that the font size is “Inherited from h3.wp-showdown-title” and the font size is from the following location.
/wp-content/themes/fashionbuzz/css/bootstrap.css?ver=4.4
Can you please advise me how I can modify these fonts in the backend?
It just doesn’t look right and this should be so easy to do..
Please help…

https://wordpress.org/plugins/showdown/