I ran into this website for the first time today and I liked the project.
The aim of One div is to create a library of single element logos/icons. All the icons presented there are realized in pure css with only one html <div> element.
This is great as alternative for svg/images, as all the icons created this way are 100% responsive. Some icons also have animation effects which would be impossible with other formats.
For more info and demos visit: onediv.com