Also, is there a way to change just part of the website's font (just for the titles of the articles but leave the rest as is?)
fernandodangelo Try add this to override.css file and change font-size value accordingly (don't forget to enable override from Template Options -> Advanced tab): :
#gk-page-title > span{font-size:1.4em !important;}
Kindly ensure to clear your browser cache if changes dont reflect