Declare properties with transition effects
transition-property
Specify which property of a selector to transition on hover.
Property values
Specify the name of the property to affect. When there is more than one property to transition, use a comma separated list.
Examples
#grow {
height: 100px;
color: #dd0000;
transition-property: height, color;
}
#grow:hover {
height: 200px;
color: #ff0000;
}