Centering the photo gallery on the Wells Template

Site URL: https://www.henrysherman.co.uk

Hi all,

I'm looking to keep the Wells Template Gallery permanently centred on my site.

At the moment the title and navigation block - on the left - mean the gallery is always slightly off centre and to the right.

Is there a way to introduce an empty container or padding to the right of the gallery that is the same size as the navigation block, so the gallery and photos stay in the centre.

Thanks in advance for your help!