It’s using page header with some custom coding: http://www.screencast.com/t/9lDxrUPTWm
If you use the browsers developer tool, you can copy the HTML structure along with the CSS that comes with it.
The align bottom is achieved by this CSS:
@media (min-width: 1024px) {
.add-on-image {
display: block;
position: absolute;
right: 0;
bottom: 0;
}
}