ref(container): use only one size for each container

README.md

@@ -108,6 +108,17 @@ cells of the content (and may be overwritten by child elements contents).
 The border of an element should be around independent of the scrolling of the
 contents, just like padding.
 
+### Scrollable contents
+
+Contents that is scrollable should be done *virtually* through the contents of
+the `Container`. This means each container contents implements scrolling for
+itself if required.
+
+This still has one issue: Layout of child elements that are already too large
+(i.e. or become too small). The library could provide automatic rendering of a
+scrollbar given the right parameters however. The scrolling input action would
+then also be implemented by the user.
+
 ### Input
 
 How is the user input handled in the containers? Should there be active