Upon visiting the URL provided below, I was able to successfully integrate a .css file into my Jenkins project. Everything appeared to be working properly until I logged out. Upon logging out of the Jenkins page, I noticed that my css file images were no longer displaying.
Jenkins Version: 1.651.3
Simple Theme Plugin Version: 0.3
Before Logging Out of My Jenkins Page:
https://i.sstatic.net/cqMej.png
After Logging Out:
https://i.sstatic.net/dv3y7.png
Error Logs:
INFO: Completed initialization
Jul 31, 2017 10:21:36 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.web.context.support.StaticWebApplicationContext@72d6be85: display name [Root WebApplicationContext]; startup date [Mon Jul 31 10:21:36 UTC 2017]
...
...
...
INFO: Jenkins is fully up and running