XF 1.5 Add more colours to prefix?

[bakens]

Hi. Just wondering if it's possible to add more colours to prefixes? Also, how would you go about changing the style of the prefix look? Instead of a bubble look, a square-type look is what i'm looking for, something similar like this forum uses https://chevereto.com/community/

 

[Paul B]

https://xenforo.com/community/resources/creating-custom-thread-and-resource-prefix-css.350/