cordova.css

.listening{
    color: red;
}
.receiving{
    color: green;
}

.blink {
    animation: fade 3000ms infinite;
    -webkit-animation: fade 3000ms infinite;
}

@keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.4; }
    to { opacity: 1.0; }
}
 
@-webkit-keyframes fade {
    from { opacity: 1.0; }
    50% { opacity: 0.4; }
    to { opacity: 1.0; }
}