Best practices for creating custom CSS styles for sections of posts?

Development
3

Checking the embed code from https://fonts.google.com/share?selection.family=Playwrite+US+Trad:wght@100..400, it looks like it should be "Playwrite US Trad"

// <uniquifier>: Use a unique and descriptive class name
// <weight>: Use a value from 100 to 400

.playwrite-us-trad-<uniquifier> {
  font-family: "Playwrite US Trad", cursive;
  font-optical-sizing: auto;
  font-weight: <weight>;
  font-style: normal;
}