Creating Streamlit themes

Build professional, brand-aligned themes using .streamlit/config.toml. This skill covers design principles and complete configuration for polished, cohesive themes.

Theme file setup

Theme options go in Streamlit's config.toml under the [theme] section:

Theme inheritance

Start from a built-in theme or external file:

[theme]
base = "light"                         # or "dark"
# base = "./my-base-theme.toml"        # Local file
# base = "https://example.com/theme.toml"  # Remote URL