feat(css): scope token classes to pre elements

Author: backwardspy

scripts/build-gh-pages

@@ -38,7 +38,7 @@ def postprocess_css(content: str) -> str:
 def flavor_css(flavor: str) -> str:
     style = PYGMENTS_STYLES[flavor]
     formatter = HtmlFormatter(style=style)
-    return formatter.get_style_defs()
+    return formatter.get_style_defs("pre")
 
 
 def variable_css() -> str: