PayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. Online money transfers serve as electronic alternatives to paying with traditional paper methods, such as checks and money orders. Most of the websites accept PayPal payment nowadays.

I particular like the loading animation of PayPal while you are logging in. Fabrice Weinberg has recreated the PayPal Loading Animation using Pure CSS. It is absolutely mind-blowing. It’s pretty amazing what can be achieved with gradients. Take a look at it, I am sure you can learn some CSS techniques there as well.

Requirements: CSS3
Demo: http://codepen.io/FWeinb/pen/BeJLo
License: License Free