Grabbed dndbeyond's source code

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

ddb_main/node_modules/@mui/material/styles/zIndex.js

@@ -0,0 +1,13 @@
+// We need to centralize the zIndex definitions as they work
+// like global values in the browser.
+const zIndex = {
+  mobileStepper: 1000,
+  fab: 1050,
+  speedDial: 1050,
+  appBar: 1100,
+  drawer: 1200,
+  modal: 1300,
+  snackbar: 1400,
+  tooltip: 1500
+};
+export default zIndex;