Transition CSS3

[flashmax]

hola haber si así lo solucionas

Código HTML:

div.expa{
	position:absolute;
	z-index:1;
       width:100px;
	height:60px;
	margin:5px;
        background-color: red;
	transition: 1s;
	-moz-transition: 1s;
	-webkit-transition: 1s;
	-o-transition: 1s;
					
 }