When visiting the pages with WHMCS WP Integration module

When visiting the pages with WHMCS WP Integration module the logo is massive when viewed in Internet Explorer and Firefox. The pages look fine in Chrome.

https://www.rocksolidhq.com/services/rock-solid-webemail-hosting/hosting-account-login/hostingportal/cart.php/?systpl=six

How do I correct this?
thanks,
Dean