diff --git a/Makefile b/Makefile
index 34e414d..af75ba4 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ WINTERSMITH = ./node_modules/.bin/wintersmith
 ARTICLE_DIR = ./contents/writing/about
 
 build:
+	@./node_modules/.bin/cleancss ./contents/css/main.css > ./contents/css/main.min.css
 	@$(WINTERSMITH) build
 
 clean:
diff --git a/package.json b/package.json
index 257fdf7..87084a1 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "main": "",
   "private": true,
   "dependencies": {
+    "clean-css": "^2.2.2",
     "moment": "~2.3.1",
     "typogr": "~0.5.2",
     "underscore": "~1.4.4",