How to use AddStylesheet method?

Hello! Thank you for making Hangfire!

I'm trying to fix [css issue](https://github.com/bamotav/Hangfire.RecurringJobAdmin/issues/100) of dashboard extension by providing my own css file as following:
```C#
DashboardRoutes.AddStylesheet(typeof(WebStartup).Assembly, "cssfix.css");
```
Unfortunately, I have broken dashboard as the result. May be I'm looking at the wrong direction, but, any way, what am I doing wrong? I set my css file to be embedded resource, I have no styles at my file at all, but dashboard is rendered broken any way. I can even pass any random resource name without any errors with the same result.

Thanks in advance for the help.

Start by reproducing the dashboard breakage with DashboardRoutes.AddStylesheet(typeof(WebStartup).Assembly, "cssfix.css") and verify how the embedded resource is named and loaded. Compare the behavior with a random resource name and confirm that the dashboard renders correctly when the stylesheet is configured properly.

Written by the indexing model from the issue text.