Change size of excerpt / read more on blog landing page

Site URL: https://marigold-wolf-xzky.squarespace.com/

I was looking to bump up the size of the type for the excerpt and read more on the article landing page. I couldn't seem to find it in the styler, so assumed it must be a custom CSS. 

Please let me know if you need any more info! Thank you in advance! 

Being that the site is in development it is password protected.

The url is:https://marigold-wolf-xzky.squarespace.com/articles
The password is: "documentation"

Add to Design > Custom CSS

/* blog excerpt */
.blog-excerpt-wrapper p {
    font-size: 30px;
}
/* blog readmore */
a.blog-more-link {
    font-size: 30px !important;
}