diff --git a/book.toml b/book.toml
index 0191baba..00c73b29 100644
--- a/book.toml
+++ b/book.toml
@@ -5,7 +5,7 @@ title = "Rust语言圣经(Rust Course)"
 src = "src"
 
 [output.html]
-additional-css = ["theme/style2.css"]
+additional-css = ["theme/style3.css"]
 additional-js = ["assets/custom.js", "assets/bigPicture.js"]
 git-repository-url = "https://github.com/sunface/rust-course"
 edit-url-template = "https://github.com/sunface/rust-course/edit/main/{path}"
diff --git a/theme/style2.css b/theme/style3.css
similarity index 100%
rename from theme/style2.css
rename to theme/style3.css