diff --git a/.gitmodules b/.gitmodules
index e69de29..4cd67be 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "themes/hugo-theme-stack"]
+	path = themes/hugo-theme-stack
+	url = https://git.sunyz.net/realSunyz/hugo-theme-stack
diff --git a/config/_default/config.yaml b/config/_default/config.yaml
index 08cfda1..c2d060e 100644
--- a/config/_default/config.yaml
+++ b/config/_default/config.yaml
@@ -1,7 +1,7 @@
 baseURL: https://sunyz.net/
-theme: 
+theme: hugo-theme-stack
 
-defaultContentLanguage: "zh-cn"
+defaultContentLanguage: "en-us"
 defaultContentLanguageInSubdir: true
 
 services:
diff --git a/themes/hugo-theme-stack b/themes/hugo-theme-stack
new file mode 160000
index 0000000..087989e
--- /dev/null
+++ b/themes/hugo-theme-stack
@@ -0,0 +1 @@
+Subproject commit 087989e4274f24a472d16d7c35d394a227fed47a