Hello,

As you haven’t shared your Site URL so we can’t tell exactly on your Site without watching it.

But under the Theme Settings > Typography > Advanced > you can create a new Rule > and in that you can select Single Product related Rules i.e. Title, Price, Old Price etc > select them all > and then you can define the Font related styles for them there: https://snipboard.io/NQR2bY.jpg

If there is something specific that you don’t find there then a Custom CSS selector can be used at the same place > and in that you can add Custom CSS on which you want to apply the Color change.

Best Regards