Would there be a way to change the size and positioning of images on portfolio project pages? I'd like to include a portrait format image without it being stretched to the full page width, as this makes it too tall to view in the browser window without scrolling. Ideally, I'm looking to tweak the CSS so all portfolio images appear at maximum 700px high and centered.

I know I could "fake" it by resizing all my images to 700px high before uploading, but won't that make them too small for proper retina display?