div {
width: 200px;
height: 200px;
background-color: 98d925#;
transition-property: background-color; /*standard*/
transition-duration: 2s;
-webkit-transition-property: background-color; /*Safari e Chrome */
-webkit-transition-duration: 2s;
-o-transition-property: background-color; /*Opera*/
-o-transition-duration: 2s;
-moz-transition-property: background-color; /*Firefox*/
-moz-transition-duration: 2s;
}
div:hover {
background-color: #ff5c00;
}
