Term Description Block
The Term Description Block allows you to display the description of categories, tags and custom taxonomies when viewing an archive page. Although you can add this block into your normal Page or Post content, it will be more useful adding it to your theme’s templates using the Full Site Editor.
Once you've added your Block, there are further options available in the Settings Sidebar. You can change the Text and Background colours, and you can also change various Typography settings like Font size and & Line height.