Viva Glint: branding and customization

Is it possible to customize the Viva Glint UI in terms of colors and\or adding the logo of the company?
The Glint UI cannot re-branded. In an upcoming release, the ability to add a logo will be available to Viva Glint customers. Keep an eye on the Viva Glint public roadmap to see when it'll be released. https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=viva%2Cglint

What we can do, in terms of customization, on reminders\questions\thank you page?
Questions and thank you pages can be updated in the survey configuration page. https://learn.microsoft.com/en-us/viva/glint/setup/questions-setup

Reminders cannot yet be customized. Email customization will be available at the same time as the logo capability.