Common use case: Have a sidebar that never collapses more than a certain amount of pixels when you resize the window.

Here’s an example where the sidebar takes 1/4 of the screen and never takes less than 200px:

.container {
  grid-template-columns: minmax(200px, 3fr) 9fr;
}

You can also set just a maximum value using the auto keyword:

.container {
  grid-template-columns: minmax(auto, 50%) 9fr;
}

or just a minimum value:

.container {
  grid-template-columns: minmax(100px, auto) 9fr;
}

Lessons in this unit: