diff --git a/book.toml b/book.toml
index b72ba694..a60bac8a 100644
--- a/book.toml
+++ b/book.toml
@@ -5,7 +5,7 @@ title = "Rust语言圣经(Rust教程 Rust Course)"
 src = "src"
 
 [output.html]
-additional-css = ["theme/style2.css"]
+additional-css = ["theme/style.css"]
 additional-js = ["assets/custom0.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/style.css
similarity index 85%
rename from theme/style2.css
rename to theme/style.css
index 16b7e034..f1879d3e 100644
--- a/theme/style2.css
+++ b/theme/style.css
@@ -50,4 +50,16 @@
     overflow: hidden;
     padding: 10px 0;
     color: gray;
+}
+
+/* 修改章节目录的间距 */
+.chapter li.chapter-item {
+    /* 没有文件时的文字颜色 */
+    color: #939da3;
+    margin-top: 1.2rem;
+}
+
+/* 修改滚动条宽度 */
+::-webkit-scrollbar {
+    width: 7px;
 }
\ No newline at end of file