Drupal's core themes
By default, Drupal 8 ships with three themes. As part of the standard installation profile, Drupal will install and configure Bartik, Seven, and Stark themes. Each of these themes serves a specific function in the workflow. Let's look at them in more detail.
Bartik
Bartik is considered the default theme in Drupal and is familiar to most as it has been part of the Drupal ecosystem for quite a while now. We can think of Bartik as the frontend theme or what we see when we first install Drupal. The Bartik theme is what you will visually see when you are not navigating within the Drupal administrative screens.
Seven
Seven is the default admin theme, and it provides a clean separation between the frontend and backend of Drupal. This ...
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