Adjust Logo Position

I’ve purchased the theme and have a slight problem…the logo I’m using is quite long horizontally (298 W x 45 H)

When the logo gets ‘small’ from scrolling it is positioned perfectly…However when the logo is ‘large’ before scrolling it is positioned far too close to the top of the screen. In the logo’s ‘large’ position, I need it down about 20 pixels down so it’s centered….but then when it becomes ‘small’ it needs to go back to the original position. To try to make this short I essentially need the logo to be ‘centered’ in the bar because it’s a wide logo.

Can you please let me know how to ‘center’ the logo when it is in it’s large form and then maintains the original position when shrunk
Thank You!