Center logo in desktop and mobile view, using Mercer (in Brine)

Site URL: https://www.emma-rose.co

Hello

I want my logo to be in the center of the page on desktop and mobile modes. I am using Mercer.

I have recently changed my template of my site, which is why if you go to it you will see it's all kind of all over the place. But all I need help with is some custom CSS to get my logo into the center.

TIA!