ons-tab

[OnsenUI]

Represents a tab inside tabbar. Each ons-tab represents a page.

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[Vincent Bastos]

For some reason my icons are not centred. How do you centre your icons?

[IliaSky]

@Vincent-Bastos Well actually they are centered by default. Here’s a demo.

Most likely you have some sort of style which is overriding the default one.
You should be able to fix it by writing

.tab-bar__button {
  text-align: center;
}

in a css file and include it. Alternatively you could just write style="text-align: center" in the ons-tab elements.