Following the principles of responsive web design, this site is optimised for a range of devices and screen sizes - desktop, tablet, mobile and anything in between. This involves a design approach that usually starts from the smallest screen size and then scales up, rather than designing for desktop first. Try resizing your screen or using this site on an iPad - you'll be pleasantly surprised.
When working on UX and development for mobile, it's important to consider not just the layout but also the interactions. This website has been optimised for both desktop and touch devices - try swiping the images above. These type of interactions are something users have grown to expect from mobile apps, but websites have been lagging behind. It's time to change that.