This is a simple widget for displaying the site description set in Appearance > Theme Options > Basic Settings:
Here’s the Largo About Site Widget configuration, as viewed in the main sidebar widget area in Appearance > Widgets:
This results in a clean and compact “About” widget in a sidebar:
Like other Largo widgets, you can add a title for display above the widget, with or without a link, choose from three backgrounds (default, reverse, or none), and optionally hide the widget on desktop displays, tablets, and/or phones.