Customize Customer Notification Emails

Hi there! I’m trying to add our brand font to the customer notification emails so they look cohesive with the rest of our store. I found another post about this and tried to follow along but my HTML customizations just aren’t working. Here’s the code I added within the style tag. Please let me know if you have any ideas, I’m new to coding!

To clarify, there’s been no change after adding this customization

Within settings.