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Themes let an app control its hosted shell without leaving Python. Use them to set the app tagline, logo, accent color, fonts, or one of Capsule’s presets.

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Apply a preset

app.theme(
    preset="midnight",
    tagline="Support operations, assisted.",
)

​
Customize colors and fonts

app.theme(
    accent="#2563EB",
    font_sans="DM Sans, sans-serif",
    font_mono="DM Mono, monospace",
)

app.theme(
    logo="/data/logo.svg",
)
If the logo comes from a generated or uploaded file, mount a filesystem and keep the path stable.

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Keep theme close to product definition

Theme belongs near the rest of the app shell: 
app = cpsl.App(name="support-ops", image=cpsl.Image())

app.theme(
    preset="midnight",
    accent="#2563EB",
    tagline="Inbox triage for support teams.",
)