Adjust Afterpay Banner in Shopify Store

The Afterpay banner on my Shopify store is currently misplaced and incorrectly sized. I need a Shopify expert to help rectify these issues.

Specific Issues:
- The Afterpay banner is not positioned correctly on the site.
- The size of the banner is incorrect.

Ideal Skills:
- Proficient in Shopify platform.
- Experience in website design and layout adjustment.
- Knowledge of Afterpay banner integration.