Borders and / or container colors

I’ve seen a lot of workarounds on how to customize the containers (using markdown, etc…) but I was wondering if it’s on the roadmap to add in UI customizations for the containers? Anything as simple as adding color inside the containers or borders, shadows, etc…
When we use st.success or st. warning we get nice, outlined boxes:
Is something similar possible for the beta_containers? I’m looking for “card / grid” layout type.
I think it can be a subtle yet powerful customization for streamlit users.