Currently, the Telerik UI for MVC requires the style-src 'self' unsafe-inline; directive present:

<meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src 'self'; script-src 'self'; style-src 'self' unsafe-inline; font-src 'self' data:;" />

We have the following requirements:
   -  As per CSP we do not use Unsafe prefix at any-level in the project.
   -  Style-src self without Unsafe-inline when it will be ready to use for MVC project