If you want to customize the theme’s color scheme to give it your individual touch, you are only a few lines of CSS away. Generally, you need to override the default settings. The easiest way to do this is to create a file named static/custom.css right at the root of your site.
By default, the admonition is rendered with a plain text label. To enable font icons the document attribute :icons: font need to be set.
AsciiDoc admonitions are special callout blocks that highlight important information in documentation using distinct visual styles and icons.
If you need more flexibility for your embedded images, you could use the img shortcode. It is using Hugo’s page resources and supports lazy loading of your images.
