This is one of the most impressive and helpful websites out there!
this has effects of buttons and effects that is pretty mind blowing.Its written in LESS,SCSS and ofcourse CSS3.
All Hover.css effects make use of a single element (with the help of some pseudo-elements where necessary), are self contained so you can easily copy and paste them, and come in CSS, Sass, and LESS flavours.
Many effects use CSS3 features such as transitions, transforms and animations. Old browsers that don't support these features may need some extra attention to be certain a fallback hover effect is still in place.