# Theme

> FullCalendar v4 documentation, for an old release. Web version: https://legacy.fullcalendar.io/v4/theming
>
> Latest version (v7): https://fullcalendar.io/docs/theming.md

It is possible to change the look of the calendar (colors, fonts, etc) by applying a *theme*. Currently, only Boostrap v4 is available.

## Articles

- [themeSystem](https://legacy.fullcalendar.io/v4/themeSystem.md) - Renders the calendar with a given theme system.
- [Bootstrap Theming](https://legacy.fullcalendar.io/v4/bootstrap-theme.md) - In order to correctly theme your calendar with a Bootstrap 4 theme, you must include the correct stylesheets, include the JavaScript plugin, and set themeSystem to 'bootstrap'.
- [bootstrapFontAwesome](https://legacy.fullcalendar.io/v4/bootstrapFontAwesome.md) - Determines which icons are displayed in buttons of the header/footer when Bootstrap 4 theming is on.

## Demos

- [Bootstrap 4 theme](https://legacy.fullcalendar.io/v4/bootstrap-theme-demo)