Style UI.X icons

[DayOfWar]

Hello, does anybody know how to change the default ui.x footer icons on xenforo?
I know that some people will come saying: put the <i fa fa-etc tags etc, but no, it would break and the color would totally change and on phone it would look like an external icon, with another size and separated, which is horrible.
I've been trying to find out how to modify it for two days and still nothing, even if I've found how to modify the nav section from the extra.less to do basically the same thing.
Can you help me out?

 

[Paul B]

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