diff --git a/book.toml b/book.toml
index 067bf45..8d7bde4 100644
--- a/book.toml
+++ b/book.toml
@@ -5,15 +5,15 @@ multilingual = false
 src = "src"
 title = "rust-note"
 
-# [preprocessor.theme]
-# pagetoc = true
-# sidebar-width = "300px"
-# pagetoc-width = "15%"
-# content-max-width = "75%"
-# content-main-margin-left  = "4%"
-# content-main-margin-right = "4%"
-# nav-chapters-max-width    = "3%"
-# nav-chapters-min-width    = "3%"
+[preprocessor.theme]
+pagetoc = true
+sidebar-width = "320px"
+pagetoc-width = "15%"
+content-max-width = "75%"
+content-main-margin-left  = "4%"
+content-main-margin-right = "4%"
+nav-chapters-max-width    = "3%"
+nav-chapters-min-width    = "3%"
 
 [output.html]
 default-theme = "ayu"
diff --git a/theme/css/variables.css b/theme/css/variables.css
index 11341fe..693a3ad 100644
--- a/theme/css/variables.css
+++ b/theme/css/variables.css
@@ -2,7 +2,7 @@
 /* Globals */
 
 :root {
-    --sidebar-width: 300px;
+    --sidebar-width: 320px;
     --sidebar-resize-indicator-width: 8px;
     --sidebar-resize-indicator-space: 2px;
     --page-padding: 15px;