Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/CharacterBuilder/components/Page/Page.tsx

@@ -0,0 +1,18 @@
+import React from "react";
+
+interface Props {
+  clsNames: Array<string>;
+}
+export default class Page extends React.PureComponent<Props> {
+  static defaultProps = {
+    clsNames: [],
+  };
+
+  render() {
+    const { clsNames, children } = this.props;
+
+    const conClassNames = [...clsNames, "builder-page"];
+
+    return <div className={conClassNames.join(" ")}>{children}</div>;
+  }
+}

ddb_main/tools/js/CharacterBuilder/components/Page/index.ts

@@ -0,0 +1,4 @@
+import Page from "./Page";
+
+export default Page;
+export { Page };