fix: fix tabbed extension

Change-Id: Id17159ac03c741e6624cd6f85a718cee0f71fbce
diff --git a/mkdocs.yml b/mkdocs.yml
index d8f18e2..61fe81a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -22,7 +22,8 @@
   - markdown.extensions.footnotes
   - markdown.extensions.toc:
       permalink: true
-  - pymdownx.tabbed
+  - pymdownx.tabbed:
+      alternate_style: true
   - pymdownx.superfences
   - pymdownx.keys
   - pymdownx.details