Hello
The UX Sig is excited to announce the Jenkins Design Library
You can view it at:
https://weekly.ci.jenkins.io/design-library/
It includes demonstrations of a number of UI components in Jenkins.
You can copy and paste ready to use examples
It provides guidance on when / how to use components where possible.
Please give it a try and let us know what else you would like to see on the Issue tracker or on Gitter.