A theme adjusts, or overrides, the default appearance of your Drupal site. It does this by giving us the ability to change the markup (with templating), functionality (with JavaScript), and appearance (with CSS). Theming is the final layer of development before the work is viewed by the user. The icing on the cake!
By default, Drupal 8 comes shipped with a number of themes in core. Let's have a look at them.
In PhpStorm, go to the root directory of your project and then navigate to core
| themes
. In this directory, you'll find five themes: Bartik, Classy, Seven, Stable, and Stark. What are these and why are they here?
Let's discuss these core themes we have available by default, as they each have a distinct use:
Bartik has been the default theme for both Drupal 7 and Drupal 8. It's well documented, well maintained, and contains some useful theme functions.
Seven has been the default administration theme for Drupal 7 and 8. The styling it contains applies to the admin interface...