Two different fonts within Testimonial Block

https://flute-alligator-dfrx.squarespace.com/

password: floral

Hi! I have a testimonial block in place for my clients site. However, in their mockup you can see, they were hoping to have 2 different fonts within the description (one that is the header, and one font that is the paragraph). Is this possible? Thanks you! 

Header has this class name

.user-items-list-banner-slideshow .list-item-content__title

paragraph is

.list-item-content__description *

so you can target them with CSS to add different fonts