I'm not sure if this is the appropriate context for this; if this instead belongs in a GHR or somewhere else, please let me know.
I would like to create a browser extension to add some new functionality/content to NationStates. The browser extension would display it on the NS website itself, but using data from my server.
I would like to imitate the existing look and feel of the NationStates website for this new functionality/content. To accomplish this, the browser extension would have to generate HTML/CSS adapted from NationStates HTML/CSS.
Since basing my HTML/CSS on NS HTML/CSS has copyright implications, I wanted to ask for permission before proceeding further.