diff --git a/package-lock.json b/package-lock.json
index e2d96e62..1135b8d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2469,6 +2469,29 @@
         }
       }
     },
+    "css": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/css/-/css-2.2.1.tgz",
+      "integrity": "sha1-c6TIHehdtmTU7mdPfUcIXjstVdw=",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.3",
+        "source-map": "0.1.43",
+        "source-map-resolve": "0.3.1",
+        "urix": "0.1.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.1.43",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.43.tgz",
+          "integrity": "sha1-wkvBRspRfBRx9drL4lcbK3+eM0Y=",
+          "dev": true,
+          "requires": {
+            "amdefine": "1.0.1"
+          }
+        }
+      }
+    },
     "ctype": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/ctype/-/ctype-0.5.3.tgz",