Great work! You should be able to inject css by placing it in <style></style> tags, same with scripts - <script></script>. Those code injections are just placed into the final html of the page, not wrapped or transformed in any way. 

 Thanks 🙏, I will try it 

 I finally did it. Thank you for creating something so cool!
https://image.nostr.build/5b0924cf213a546c3facc4e016392f0886116547ecbfbad42b257cdaa45eeb0f.png 

 Looks awesome!