Scroll container

Allows for vertical scroll within the element, enabled by the contain: size property/value. This allows it to be easily used in flex containers (e.g. stretched items across the height of the parent).

Note

always test the implementation in various use cases. For instance, on this site, the main content uses this class. However, on smaller screens, the `contain: size` needs to be replaced with `contain: none`, as the height would otherwise not fill the available space (due to flex-wrapping).