How can I create a class for each category

[darkboy245]

I'd like to modify each category with CSS but in vBulletin 5 I can only do that with forums and not categories.
How can I make a unique class for each individual category?
lets say Category 1 is #Cat1, category 2 is #Cat2, etc.

The purpose of this is so I can create a grid-view for categories.

Thanks

[yilmaz]

Have I got it right?

<tr class="forum-item sub new" id="forum173" data-channel-id="173" data-lastcontent="1599453750" data-readtime="0">


tr#forum173 {
background: black;
}



Screenshot

https://vborg.vbsupport.ru/attachment.php?attachmentid=157915&stc=1&d=1604539568

[darkboy245]

Have I got it right?

<tr class="forum-item sub new" id="forum173" data-channel-id="173" data-lastcontent="1599453750" data-readtime="0">


tr#forum173 {
background: black;
}



Screenshot

https://vborg.vbsupport.ru/attachment.php?attachmentid=157915&stc=1&d=1604539568

This is right but for individual forums, I want to be able to edit a whole category container
https://image.prntscr.com/image/y2R5Q94_QB2RfaOCgQKVPQ.png

so if "Test Category" id was 20, the class would be #category20 or something like that, just like forums.