Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

It looks like long Markdown lines overflow in e.g. st.container(border=True)

Reproducible Code Example

long_1 = (
    "ACME_WIDGET_RECOMMENDATION_BANNER_ALPHA_WITH_ADDITIONAL_FEATURES_AND_CUSTOMIZATION_OPTIONS"
)

long_2 = "ACME_SEARCH_RECOMMENDATION_BANNER_BETA_WITH_ENHANCED_PERSONALIZATION_AND_TARGETING_CAPABILITIES"

cols = st.columns(3)

with cols[0].container(border=True):
    st.markdown("##### Example card")
    st.markdown("Promotions:")
    st.markdown(f"- {long_1}")
    st.markdown(f"- {long_2}")

Steps To Reproduce

No response

Expected Behavior

No response

Current Behavior

No response

Is this a regression?

• Yes, this used to work in a previous version.

Debug info

• Streamlit version: 1.49.1.dev20250827
• Python version:
• Operating System:
• Browser:

Additional Information

No response