Hello Randy Bauer,
In Sitefinity 3.7 we use embedded templates. There are two possible ways that you can use to achieve this task.
1. Override the css classes in your theme css.
2. Map the external templates( external template package is available for downloading from downloads section of your account). Inside the templates there is CssFileLink control which has a reference to the embedded resource. Modify the CssFileLink property to refer your custom css class.
"PATH TO YOUR CSS"
I attached the common layout for PollsBox, EventsView, BlogPosts, Libraries and Newsletters.
the Telerik team