Seven
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Seven is a contributed theme that was previously the default administrative theme for Drupal 7, 8, and 9. It is still available for sites that prefer or require it, though it has been replaced by Claro in Drupal 10.
Seven was the default administrative theme for Drupal 7, 8, and 9.
In Drupal 10, it was replaced by Claro.
For sites that still require or prefer Seven, it is available here as contributed theme.