Groundhog offers different layout types:
Sidebar and contents like you see it on the components page. Sidebar hides on smaller screens.
Standard islands. Responsive flex containers that organise themselves next to each other should space be available.
Islands can be nested to allow for more flexible layouts
This layout allows to separate the content in main and aside.
This layout allows to separate the content in main and aside, additionally it provides a sidebar.
Columns allow to structure the content in two or 3 columns.