diff --git a/assets/css/_fonts.scss b/assets/css/_addon/fonts.scss
similarity index 100%
rename from assets/css/_fonts.scss
rename to assets/css/_addon/fonts.scss
diff --git a/assets/css/_module.scss b/assets/css/_addon/module.scss
similarity index 100%
rename from assets/css/_module.scss
rename to assets/css/_addon/module.scss
diff --git a/assets/css/_variables.scss b/assets/css/_addon/variables.scss
similarity index 100%
rename from assets/css/_variables.scss
rename to assets/css/_addon/variables.scss
diff --git a/assets/css/main.scss b/assets/css/main.scss
index 1c00c2e..81e98b4 100644
--- a/assets/css/main.scss
+++ b/assets/css/main.scss
@@ -8,9 +8,9 @@
 * MIT Licensed
 */
 
-@import "_fonts";
-@import "_module";
-@import "_variables";
+@import "_addon/fonts";
+@import "_addon/module";
+@import "_addon/variables";
 @import "_colors/light-typography";
 @import "_colors/dark-typography";
 
diff --git a/assets/css/post.scss b/assets/css/post.scss
index e1cdeae..f412c9c 100644
--- a/assets/css/post.scss
+++ b/assets/css/post.scss
@@ -7,7 +7,7 @@
   © 2019 Cotes Chung
   MIT License
 */
-@import "_variables";
+@import "_addon/variables";
 
 $prompt-older: "{{ site.data.label.post.button.previous }}";
 $prompt-newer: "{{ site.data.label.post.button.next }}";