The Telerik ASP.NET Core ExpansionPanel component has 20+ built-in themes such as Default (our own styling), Material (based on the Material Design guidelines), Bootstrap (which looks like the Bootstrap styling to integrate better) and Fluent (based on Microsoft Fluent UI). You can easily customize any of out-of-the-box themes with a few lines of CSS, or create new theme to match your colors and branding by using the Telerik SASS ThemeBuilder application.
See Telerik UI for ASP.NET Core in action and check out how much it can do out-of-the-box.
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