flex_subtitle = "built using jupyter-flex"
flex_external_link = "https://github.com/danielfrg/jupyter-flex/blob/master/examples/layouts/sidebar-pages.ipynb"
flex_show_source = True
This sidebar only appears of page 1.
Page 2 doesn't have a sidebar.
Page 3 has a different one.
# <code>
# <code>
# <code>
This card has size=9
This card has size=3
# <code>
# <code>