diff --git a/Dockerfile b/Dockerfile
index 4ceae22959..e168c3e6dc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@ RUN apk add --no-cache \
     build-base \
     libc6-compat \
     npm && \
-    npm install -G autoprefixer postcss-cli
+    npm install -D autoprefixer postcss-cli
 
 ARG HUGO_VERSION
 
diff --git a/Makefile b/Makefile
index 0fa3608840..58babc3627 100644
--- a/Makefile
+++ b/Makefile
@@ -65,7 +65,7 @@ container-image:
 		--build-arg HUGO_VERSION=$(HUGO_VERSION)
 
 container-build: module-check
-	$(CONTAINER_RUN) --read-only $(CONTAINER_IMAGE) sh -c "npm ci && hugo --minify"
+	$(CONTAINER_RUN) --read-only --mount type=tmpfs,destination=/tmp,tmpfs-mode=01777 $(CONTAINER_IMAGE) sh -c "npm ci && hugo --minify"
 
 container-serve: module-check
 	$(CONTAINER_RUN) --read-only --mount type=tmpfs,destination=/tmp,tmpfs-mode=01777 -p 1313:1313 $(CONTAINER_IMAGE) hugo server --buildFuture --bind 0.0.0.0 --destination /tmp/hugo --cleanDestinationDir