First off, Drupal 8 is responsive out of the box, meaning that the default Bartik theme, the Seven administration theme, and even the Admin toolbar scale and resize based on the device we are viewing our site on.
We can see this in action by logging in to our Drupal instance and then navigating to our homepage. If we begin to resize the browser window, eventually we will notice the orientation of the Admin toolbar change from a horizontal bar to a vertical bar:
Once the Admin toolbar is at a vertical orientation, we can collapse it into the horizontal bar by clicking on the Manage link at the top left-hand side. This allows ...
