#Introduction to Page Shells
Bumbag comes with a set of "page shells" which are components to help you build page layouts.
There are three page shells:
<PageWithSidebar>: To build a page layout with a sidebar
<PageWithHeader>: To build a page layout with a header
<PageContent>: To build a page layout with margined content
You can set a global collapse breakpoint for your pages. When the page viewport width is below the
collapseBelow breakpoint, then the page will be collapsed and the sidebar (if one is set) will be hidden.