containers/base/php-base/Dockerfile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/containers/base/php-base/Dockerfile b/containers/base/php-base/Dockerfile
index e885e49..44eba4f 100644
--- a/containers/base/php-base/Dockerfile
+++ b/containers/base/php-base/Dockerfile
@@ -67,7 +67,8 @@ RUN apt-get clean && apt-get update && \
     unzip \
     sqlite3 && \
    apt-get clean && apt-get autoremove -y && \
-    rm /etc/cron.d/php5
+    rm /etc/cron.d/php5 && \
+    npm install -g csslint
 
 ##
 # PHPENV.