Form Submission Error Font Change

Hey, 

I've searched high and low for an answer to no avail! 

I'm looking to change the font of the error messages that pop up on the submission form. See attached

Here's the link:
https://sailfish-deer-n6pr.squarespace.com/config/help

Please Help!

The site is private. Can you setup an access password? We can access site easier

any luck with this? i'm looking to change the font size of the error message, 7.1

1 hour ago, daniellenoakes said:

any luck with this? i'm looking to change the font size of the error message, 7.1

Which font do you want?

51 minutes ago, Web_Solutions said:

Which font do you want?

im using roc-grotesk-wide, but i wish to change the size to 0.8em

4 hours ago, daniellenoakes said:

im using roc-grotesk-wide, but i wish to change the size to 0.8em

This is the code for change font name and font size

form .title p{
  font-family: 'Gotham-Light' !important;
  font-size: 0.8em !important;
}