diff --git a/book.json b/book.json
index 5933ab4..3d13255 100644
--- a/book.json
+++ b/book.json
@@ -62,7 +62,8 @@
       "tag": "b"
     },
     "add-js-css": {
-      "css": [ "./custom-style.css" ]
+      "css": [ "./custom_style.css" ],
+      "js": [ "./custom_script.js" ]
     },
     "navigation": {
       "navigatorList": [
diff --git a/custom_script.js b/custom_script.js
new file mode 100644
index 0000000..7a78b6e
--- /dev/null
+++ b/custom_script.js
@@ -0,0 +1,5 @@
+var honkit_link = $('a[class=gitbook-link]');
+
+var text = honkit_link.text();
+honkit_link.parent().html(`<span style="align: center;">${text}</span>`);
+
diff --git a/custom-style.css b/custom_style.css
similarity index 100%
rename from custom-style.css
rename to custom_style.css