Lock brand styles into a Theme, or inherit your app's font

Two ways to keep experiences on brand without styling each one by hand.

Design tokens and Design Controls.
Themes set defaults, but nothing stopped a builder straying from your brand guidelines. Add color and font tokens to a Theme, or import a JSON file from Figma or your design system, then set Design Controls to Included, Emphasized, or Exclusive to control how far anyone can go outside them. Edit a token's value and every experience using it updates, published ones included.
Auto fonts.
Flows 2.0, Embeds, NPS 2.0, Banners, and Launchpads offered a short fixed list of fonts. Set the font to Auto and text inherits whatever your app uses where the experience renders. It's the default on new experiences.

Design Controls apply to web experiences only.