Customizing Appearance

Themes

qrtdown uses Quarto’s built-in themes. Set the theme in _qrtdown.yml:

template:
  theme: flatly

Popular options include:

See the complete list at Quarto HTML Themes.

Control how long code lines are displayed:

template:
  theme: cosmo
  code_overflow: wrap

Options for code_overflow:

Value	Behavior
`wrap`	Long lines wrap to next line (default)
`scroll`	Horizontal scrollbar for long lines
`none`	No special handling

Here’s the full template section with all options:

template:
  # Quarto theme
  theme: cosmo

  # How to handle long code lines
  code_overflow: wrap

For advanced customization beyond themes, you can add custom CSS. Create a styles.css file in your package root and reference it:

template:
  theme: cosmo
  css: styles.css

Then add your custom styles:

/* styles.css */
.navbar {
  background-color: #2c3e50;
}

code {
  color: #e74c3c;
}