Help with changing the font in a card layout (Heights Template)

Site URL: https://morelifeadventures.com/our-mission

Hello, I am trying to change the font size in the title and description of my coaches on this page https://morelifeadventures.com/our-mission

This is a card layout. I realise that code is needed, however I have no clue what code to put in. Has anyone dealt with this before?

Thank you,

Stella 

We couldn't find the page you were looking for. This is either because:

• There is an error in the URL entered into your web browser. Please check the URL and try again.
• The page you are looking for has been moved or deleted.