diff --git a/gumbo-millennium/Makefile b/gumbo-millennium/Makefile
index 3483c34..8f58622 100644
--- a/gumbo-millennium/Makefile
+++ b/gumbo-millennium/Makefile
@@ -1,4 +1,19 @@
-.PHONY: plugin.zip
+.PHONY: plugin.zip install lint
+
+install:
+  composer install --no-progress --no-suggest -an
+  yarn install --frozen-lockfile
+
+lint:
+  # Lint PHP code
+  vendor/bin/phpcs
+
+  # Lint Sass files
+  find lib/sass -type f -name '*.scss' -print | xargs node_modules/.bin/stylelint
+
+  # Lint Javascript
+  find lib/ -type f -name '*.js' -print | xargs node_modules/.bin/eslint
+  find lib/ -type f -name '*.jsx' -print | xargs node_modules/.bin/eslint
 
 plugin.zip: gumbo-millennium.zip
 	cp gumbo-millennium.zip plugin.zip
diff --git a/gumbo-millennium/package.json b/gumbo-millennium/package.json
index 863e066..1a77b48 100644
--- a/gumbo-millennium/package.json
+++ b/gumbo-millennium/package.json
@@ -25,6 +25,7 @@
     "babel-plugin-sass-vars": "^0.2.1",
     "babel-plugin-transform-react-jsx": "^6.24.1",
     "babel-preset-react": "^6.24.1",
+    "bootstrap": "^4.1.3",
     "classnames": "^2.2.6",
     "cleave.js": "^1.3.7",
     "cross-env": "^5.1",
diff --git a/gumbo-millennium/yarn.lock b/gumbo-millennium/yarn.lock
index a88fce9..743350b 100644
--- a/gumbo-millennium/yarn.lock
+++ b/gumbo-millennium/yarn.lock
@@ -1277,6 +1277,11 @@ bonjour@^3.5.0:
     multicast-dns "^6.0.1"
     multicast-dns-service-types "^1.1.0"
 
+bootstrap@^4.1.3:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.3.tgz#0eb371af2c8448e8c210411d0cb824a6409a12be"
+  integrity sha512-rDFIzgXcof0jDyjNosjv4Sno77X4KuPeFxG2XZZv1/Kc8DRVGVADdoQyyOVDwPqL36DDmtCQbrpMCqvpPLJQ0w==
+
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"