When you choose to hide a coupon, a button is shown instead of the coupon. This button shows ‘Show Code’ or custom text you want to show. By default, the color of this button is blue. Here’s how you can change it.
Go to Settings under Coupons menu. Click on Hide Coupon Settings.
Click on the color picker with the label ‘Hidden Coupon Button Color‘. Choose your desired color and click on Save Settings. You’re done!