- influences the appearance of the systems (colour scheme, arrangement, design, etc.)
- Gray admin bar → Appearance → "Bartik" currently default (settings especially good to set)
- Administration pages can be set in another theme, e.g. "Seven".
- "Bartik": side is subject to structure, e.g: Header, side bar, etc.
- Can be set separately
- Color encodings can be copied to adopt the same colors for different areas
- Drupal male can be removed: Logo Image → Remove check mark and select image
- Safe configuration