Welcome to the Streamlit community and thank you for the kind words 
Weāve had that come up a few times recently, and weāre considering different ways to support it. We want to make theming super easy, so the exact API may take a little time to land. Hereās a feature request you can follow/upvote/comment on!
In the meantime, some users have been hacking this together by passing a <style> block into st.markdown with unsafe_allow_html=True. The problem with this is youāll have to update a lot of styles to get things to look the way you want it 
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Hope this helps and good luck on the presentation, weād love to hear how it goes!