.blink{
    -webkit-animation: blink 1500ms infinite alternate;
    -moz-animation: blink 1500ms infinite alternate;
    -o-animation: blink 1500ms infinite alternate;
    animation: blink 1500ms infinite alternate;
}
@-webkit-keyframes blink {
	from {background-color: red;}
    to {background-color: yellow;}
}
@-o-keyframes blink {
	from {background-color: red;}
    to {background-color: yellow;}
}
@-moz-keyframes blink {
	from {background-color: red;}
    to {background-color: yellow;}
}
@keyframes blink {
	from {background-color: red;}
    to {background-color: yellow;}
}