Add missing Styles import

e2e_tests/test_apps/basic.py

@@ -1,11 +1,11 @@
 from pathlib import Path
 
-from rich.align import Align
 from rich.console import RenderableType
 from rich.syntax import Syntax
 from rich.text import Text
 
 from textual.app import App
+from textual.css.styles import Styles
 from textual.widget import Widget
 from textual.widgets import Static