To reproduce this bug:

1. npm install
2. npx webpack-dev-server
3. open http://localhost:8080
4. note that the box on the page is red - because app.css sets it to be red and is imported after leaflet.css
5. uncomment the maxSize parameter in webpack.config.js
6. ctrl+c
7. npx webpack-dev-server
8. open http://localhost:8080
9. note that the box on the page is grey - app.css is being loaded first, and then overriden by leaflet.css