Hello,

Please navigate to Theme Settings -> Typography -> Advanced -> create a new rule with the below custom selector.

.home-categories .promo-banner .wd-button-wrapper a

Then adjust the font size in the appropriate field (more detail in the below screenshot).

https://monosnap.com/file/t5SUKGTZoJmN7aQgIQdAQN1U5K7To3

Kind Regards