Board Thread:Support Requests - Designing Your Wiki/@comment-25867149-20201017195910/@comment-45117243-20201018192155

Ideally, never use it. Even if it's your own code and no one else will ever touch it - using !important will make it harder for you to maintain the code in the future.

As a wiki admin, where your code affects other people's code - using !important is even worse (unless it's in your personal CSS).

I would say there are 3 cases when you will use !important on the wiki CSS:
 * 1) When you have to override an inline style (those in the style="...") - this is rare.
 * 2) When you have to override another rule that used !important (you see the problem? The first person forced you to it, and you are pushing the problem to the next person)
 * 3) When you just can't figure out how to make your rule specific enough to override the existing rule (but try asking someone who may be able to help).