Pancake stack

Unlike the deconstructed pancake, this example does not wrap its children when the screen size changes. Commonly referred to as a sticky footer, this layout is used for both websites and apps, across mobile applications (the footer is commonly a toolbar), and websites—in particular single page applications.

Adding display: grid to the component will give you a single column grid, however the main area will only be as tall as the content with the footer below it.

To make the footer stick to the bottom, add:

.parent {
  display: grid;
  grid-template-rows: auto 1fr auto;
}

This sets the header and footer content to automatically take the size of their children, and applies the remaining space (1fr) to the main area, while the auto sized row will take the size of the minimum content of its children, so as that content increases in size, the row itself will grow to adjust.