This KB requires the Confluence instance to enable the HTML Macro. Enabling these macros will open your Confluence site to cross-site scripting attacks. Do not enable them unless you trust all your users!
.sr-showcase>.showcase-title (to format Showcase title)
.sr-showcase>.showcase-caption (to format Showcase description)
.sr-showcase (to format Showcase)
You may want more customization options for the Showcase macro than what is available by default.
For example, you can use the following syntax in the HTML macro to format the Showcase title, description, button, and body:
Currently, it is not possible to customize the button's text color
For the button to appear in preview or in the page, the Button Link property has to have a link.