During implementation, your Catalog is designed with your institution’s branding (including fonts, colors, navigation, etc.). If your institution’s website will change, you will want your Catalog to reflect the new look. As an administrator you have access to make some smaller Header and Footer Changes of your catalog. These would include link updates, label changes, etc. All other changes would involve a web-template redesign as offered here. A web-template redesign includes changing headers/footers completely to match rebranding, updating stylesheets etc.