These docs are for an old release. Info on upgrading to v5
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Renders the calendar with a given theme system.

String, default: 'standard'

Renders a minimal look & feel, the look in most of the demos. Does not require any CSS files beyond the FullCalendar base files.
Prepares the calendar for a Bootstrap 4 theme. There are other instructions you must follow to get Bootstrap theming working ยป