Center Logo

I have a client who we are using the Anderson Pro Version. She really wants her logo centered but I’m having difficulties make that happen. I’ve spent hours now researching this and there are so many ways to center/lines of code for it and none of them seem to be working. I’ve been uploading to header.php

Please advise on how to make the logo center in this theme? Where should I be inputting the code and what code works best to make this happen.

Thank you!
Suzy