Frontend look & feel for addon ingress

Hi,
Id like to develop an addon ingress page that has the look and feel of the regular frontend.
Is there a library of html components like a styleguide or i can load a css to mach the useres theme?

http://design.home-assistant.io was pointed out on the discord server.

I could propably copy some of the sources there but there doesn’t appear to be any quick „add-on pack“

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