the SDK help should have a chapter called "Customizing the Application Theme". No real SDK work needed but it explains how you can introduce a custom theme to design the UI your own way.
is this also possible for the Supplier Portal?
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yes. Basically you adjust the appearance via CSS in <SupplierInstallationRoot>\tomcat\webapps\hsx\html\css\custom.css
Just refer to the Chapter "Styling and E-Mail Templates" underneath "Customizing" - "Supplier Portal" in the Technical Documentation for details.