This is a custom dark theme for Portainer, inspired by the work of "STaRDoGG", now based on Google's Material Design color palette.
Portainer doesn't (not now) support custom css, so we have to take help from a few tools. I prefer to use Stylus from the chrome web store, but you can also use Stylish.
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Copy & Paste the content of material.css to Stylus and enable it.
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Set "Urls starting with": http:https://192.168.1.100:9000 (LAN IP:PORT of your portainer instance.)