how to change font/color of site title in header?

I’m trying to do three things:

1) I’d like to change the font and color of my site title & description in the header.

2) I’d like to align the site title to the top of the page, not the center of the header.

3) I’d like to center the background image.

My website is: https://www.screenwriterswife.com

Can anyone help with the code I’ll need to change these? Thanks so much!