- Login to your paypal account
- click on profile click on custom page styles
- click on add Change PAge Style Name to something different to PayPal
- Set up your custom Page Style
- Once your finished, click on Preview to see how your checkout page
looks
- If it suits you click on Save On the main custom page styles page,
please choose your page style and click on make Primary
- After you've done that your customers will see your customized
checkout page
If you are using a third party shopping cart, you could check with them if they are over-writing PayPal checkout page styles.