A side sheet describes a particular type of the sheet (an interface surface) with additional content, tailored to either right or left edge of the screen. They might be of two types:
Have additional content, and stay visible while interacting with the main part of the layout. It is used for navigator and filters of desktop and tablet interfaces.
Used in mobile interfaces due to the small screen size of a gadget. Having the same type of content inside, they have to be dismissed first to interact with the main screen.
The rich text element allows you to create and format headings, paragraphs, blockquotes, images, and video all in one place instead of having to add and format them individually. Just double-click and easily create content.
A rich text element can be used with static or dynamic content. For static content, just drop it into any page and begin editing. For dynamic content, add a rich text field to any collection and then connect a rich text element to that field in the settings panel. Voila!
Headings, paragraphs, blockquotes, figures, images, and figure captions can all be styled after a class is added to the rich text element using the "When inside of" nested selector system.