The accent color that is used throughout the template is a modern blue nuance which comes together perfectly with the UI components framework that has been used: MUI (Material-UI). It is powered by version 5.8.2 which is the latest one that has been released.
Tokyo Free White is free and open source and would be a great companion in your development endeavours. You can easily change the look and feel by editing a single variables file that holds all the styling options in one place.
There are multiple options available, in terms of pages and components, even for a free open source admin template dashboard. Buttons, modals, accordions, most common components are already included and styled.
There is also a messenger page application example, an API calls dynamic table page and even a cryptocurrency inspired dashboard.