Pulsating element

p.pulsating {
    font-size: 13px;
    color: #bf5b5b;
   -webkit-animation: pulsate 3s ease-out;
   -webkit-animation-iteration-count: infinite; 
   opacity: 0.5;
}
@-webkit-keyframes pulsate {
    0% { 
        opacity: 0.5;
    }
    50% { 
        opacity: 1.0;
	font-size:13.5px;
    }
    100% { 
        opacity: 0.5;
    }
}