The shortcode used to create this specific gallery is as follows:

[img_gallery id="81" type="fancybox" layout="1" orderby="random" order="DESC" description="This is just an example of some text. Text on gallery pages can be inserted either Above or Below depending on your selection. Galleries can also be created either as a Page or Shortcode with a variety of additional options available to customize as desired." placement="below"]

The options available to the Gallery shortcodes are as follows:

For more details creating Galleries, checkout our blog tutorial: How to create Galleries with Shortcodes