If you define what you mean by centering I'll give you a straight answer.
Vertically? Horizontally? Center the text or the entire box? Compared to the viewport, the parent container or the entire page?
"Centering" isn't as straight forward as you'd think, and what you actually want usually depends on the situation.
Yeah that works if you wanna center a box of content it relative to the parent container, either horizontally or vertically. For other situations we've got different tools