update design

package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "404.js",
   "scripts": {
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "test": "node --test tests/*.test.js"
   },
   "repository": {
     "type": "git",