diff --git a/Makefile b/Makefile
index 437e318..146632f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,19 @@
+ifndef dev
+sass_opts = --no-source-map --style=compressed
+endif
+
 .PHONY: all
 all: build/index.html build/style.css
 
+.PHONY: clean
+clean:
+	rm -v build/index.html build/style.css*
+
 build/index.html: index.html config.toml compile.js
 	node compile.js
 
 build/style.css: scss/style.scss node_modules/bootstrap/scss/_root.scss
-	npx sass --no-source-map --style=compressed $< $@
+	npx sass $(sass_opts) $< $@
 
 node_modules/bootstrap/scss/_root.scss: package-lock.json
 	npm ci