This is just css. There are no javascript or flash code !

For more CSS3 Transition demos, please go to this article from my blog.

This is the css code :

.container {
  padding: 10px;
  display: inline-block;
  overflow: auto;
}
.container .box1 {
  width: 200px;
  height: 200px;
  margin: 10px;
  
  -moz-transition-duration: 1s;
  -webkit-transition-duration: 1s;
  -o-transition-duration: 1s;
  
  -moz-border-radius: 20px;
  -webkit-border-radius: 20px;
  border-radius: 20px;
  
  background-color: #f00;
  border: 2px solid #900;
  
  line-height: 200px;
  text-align: center;
  font-size: 30px;
  font-weight: bold;
  color: white;
}
.container:hover .box1 {
  -moz-border-radius: 200px;
  -webkit-border-radius: 200px;
  border-radius: 200px;
  
  background-color: #fa0;
  border: 5px solid #930;
  
  font-size: 60px;
  text-shadow: 0px 0px 4px black;
}