Can I customize the appearance or behavior of the `error-overlay-webpack-plugin`?

Yes, the `error-overlay-webpack-plugin` offers some customization options, though they are often focused on the underlying module injection rather than extensive styling. For instance, you can disable the overlay for warnings using `new ErrorOverlayPlugin({ exclude: [ /warning/ ] })` or customize the injected entry files. For deeper visual customization, you might need to fork the plugin or apply global CSS overrides, as direct styling options are limited compared to some other error reporting tools.