Imports AntD CSS file only during development time

because babel-plugin-import will add just enough CSS via webpack plugin wired by react-app-rewire

src/index.js

@@ -6,9 +6,15 @@ import { Layout, Row, Col } from "antd";
 import Wizard from "./container/Wizard";
 import AppFooter from "./components/AppFooter";
 
-import "antd/dist/antd.css";
 import "./styles.css";
 
+// CodeSandBox doesn't honor react-app-rewire.
+// So let's import it during development mode only.
+// When published on Netlify, it'd be stripped off.
+if (process.env.NODE_ENV === "development") {
+  import("antd/dist/antd.css");
+}
+
 const { Content } = Layout;
 const dimension = {
   span: 20,