How to get the new (16.7+) box macro style after upgrading

Hi, I upgraded my XWiki instance from v. 15 to 16.10.4. My info boxes look like this:

The box macro extension page shows the new polished box macro style that was introduced with v. 16.7. How can I enable it?

Hello. What color theme are you using? Maybe you need to adjust the boxes color to match the text color you’re using (seems to be green)?

Note: There’s nothing to enable.

I’m using the Flatly color theme with the Default XWiki Skin. The green is just for links. Normal text is black outside boxes and white inside boxes. I’d rather avoid doing manual adjustment and just go with the style shown on Box Macro:

…if possible

This is what I get with XWiki 17.5.0 with Flatly:

Ok, same as me. So the boxes shown on Box Macro are customized? And how can I customize them?

No, they’re just an example with the default color theme (iceberg). Each theme has its own colors.

Switching to Iceberg gave me the boxes style that I wanted.