The callout box includes an icon, and the post content. This plugin uses Heroicons and php-heroicons PHP package. Icons A callout box includes an icon that describes what’s the purpose of the callout box. The plugin is using Heroicons so you can go to its website and see what icons are available to use within this plugin. You can use solid and outline icons. Types A callout box can have multiple types: primary success danger warning By default, the callout box is primary. Icon Methods The icon method can be 2 types: solid outline By default, for shortcodes and Gutenberg the icon method is solid. Shortcode For WordPress Classic Editor or even Gutenberg, you can use the shortcode: [wp-callout icon="check-circle" type="primary" method="solid"] Welcome to WordPress. This is the post content. [/wp-callout] The shortcode supports 3 attributes: icon. The icon to show in the callout box. (Default: check-circle) type Callout box type. (Default: primary) method (Default: solid) Gutenberg Block For Gutenberg users, you can use Callout Box block. Every Gutenberg Callout Box, you can change the icon, type and method using the block properties. Those properties are the same for the shortcode. Then, you just type your callout box content inside the Gutenberg block. Block Presets When you insert a new Gutenberg Block Callout you can select 1 of the 4 presets installed in the plugin: Information Success Danger Warning After you select one preset, your callout box will change its background color and icon.