Telling theme has few extra classes to help with creating content. You can add these classes to the Gutenberg block’s Advanced > Additional CSS Class field or classic elements any time.

Styled lists

This list style can be used to create a custom in-post pagination table of contents. View example.

styled-paging

Responsive design

This class will hide element on screens smaller than 1100px:

telling-hide-on-1100

This class will hide element on screens smaller than 979px – starting with tablet portrait:

telling-hide-on-tablet

This class will hide element on screens smaller than 767px – starting with mobile landscape:

telling-hide-on-mobile