Adding a Full-Width Slider to WordPress

Hi! I’d like to add a full-width page slider to my WordPress site like I see on the Lawrenceville site http://www.lawrenceville.org/. See how the inner image stays within the borders of the page and the adjacent images are in the background next to it? I like that feature and I would like to add it to my site. Do you know what they’re using, and do you know of any WordPress plugins which can accomplish this?

I’ve been looking all over for a slider but have only found ones which feature images in a confined space or span across the entire page, but none which display their images like this.

I am fine with editing the HTML and CSS, so if that’s necessary to do this, that’s fine.

Thank you very much!
Multi