diff --git a/bb.edn b/bb.edn
index 45bdbb8..2692236 100644
--- a/bb.edn
+++ b/bb.edn
@@ -1,5 +1,6 @@
 {:paths ["bb"]
- :deps {hiccup/hiccup {:mvn/version "1.0.5"}}
+ :deps {hiccup/hiccup {:mvn/version "1.0.5"}
+        clojure.java-time/clojure.java-time {:mvn/version "1.1.0"}}
  :min-bb-version "0.4.0"
  :tasks
  {clean {:doc "clean temporary assets"
diff --git a/build.clj b/build.clj
new file mode 100755
index 0000000..dc92d2d
--- /dev/null
+++ b/build.clj
@@ -0,0 +1,41 @@
+#!/usr/bin/env bb
+(require '[babashka.fs :as fs]
+         '[babashka.process :refer [process]]
+         '[java-time.api :as jt])
+
+(def dist "_build")
+(def tmp-dir (-> (fs/create-temp-dir)
+                 (fs/delete-on-exit)))
+
+(def tmp-css (fs/file tmp-dir "tmp.css"))
+(def brut-css "brut.min.css")
+
+(fs/create-dirs dist)
+
+(def sub-css
+  ["colors"
+   "extended-colors"
+   "general"
+   "buttons"
+   "grid"
+   "components"
+   "headings"
+   "icons"
+   "forms"
+   "navbar"
+   "tables"
+   "messages"])
+
+(spit tmp-css (str "/* Copyright %s Yann Esposito; MIT licensed */"
+                   (jt/year (jt/local-date))))
+(doseq [item sub-css]
+  (println "building: %s" item)
+  (let [css (fs/file tmp-dir (str item ".css"))
+        min-css (fs/file tmp-dir (str item ".min.css"))]
+    (process ["lessc" (format "src/%s.less" item)]  {:out css})
+    (process ["minify" min-css]  {:out min-css})
+    (when-not (= "extended-colors" item)
+      (spit tmp-css (slurp min-css) :append true))))
+
+(fs/move tmp-css brut-css :replace-existing :atomic-move)
+(println "build: " brut-css)