diff --git a/.gitmodules b/.gitmodules
index 5c033d5..dd4150c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "themes/book"]
 	path = themes/book
-	url = https://github.com/tomoyanonymous/hugo-book.git
+	url = https://github.com/alex-shpak/hugo-book.git
diff --git a/assets/_custom.scss b/assets/_custom.scss
new file mode 100644
index 0000000..20d4a83
--- /dev/null
+++ b/assets/_custom.scss
@@ -0,0 +1,15 @@
+body {
+    //mod by tomoya
+    font-family: "Helvetica Neue",
+      Arial,
+      "Hiragino Sans",
+      "Hiragino Kaku Gothic ProN",
+      Meiryo,
+      sans-serif;
+      font-feature-settings: "palt" 1;
+      word-break: auto-phrase;
+    }
+  
+  code {
+    font-family: monospace;
+  }
\ No newline at end of file
diff --git a/themes/book b/themes/book
index c008460..5e15ddb 160000
--- a/themes/book
+++ b/themes/book
@@ -1 +1 @@
-Subproject commit c0084602cea8f33b609e04e3d00809b5401e90ec
+Subproject commit 5e15ddb4f430cd9ded6bf232ede14d468ccb41f1