Custom CSS trouble with the field text in a form

I’m trying to center the field text in a form and can’t get anything to work. Full disclosure, I’m not great with custom code but can generally end up where I need to be.

Here’s what I’m looking at:
Screen Shot 2021-10-28 at 11.17.32 AM
Screen Shot 2021-10-28 at 11.17.47 AM

Got any tips?