You’d have to use your browser’s Developer Tools to figure out which style class it is using and inject some CSS. You can get an idea of how this is done in Request Focus in Perspective Table Search Bar - #5 by Transistor.
Note that centering numeric values like that is going to look amateurish. Having them right-aligned would be best so that thousands, hundreds, tens and units line up.
Have a good read of some user interface design guides and look at professionally designed user interfaces on your computer and phone.