Careta offers automaticly a little set of shortcodes that you can use to emphasize some portions of your text.

A lot of Plugins give this support for WordPress, but the Theme have the vantage to bring everything that you need in a single file. without need to install thirdy files.

You can use the shortcodes with this sintax:

[alert] some text [/alert]
[info] some text [/info]
[error] some text [/error]

On use it, the page/post show a specific style for the text into a box: