<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" type="text/css"/>

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<i class='pulse fa fa-heart fa-lg' style='color:#FF0000;font-size: 1.5em'></i>

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<style type='text/css'>

.pulse{-webkit-animation:pulse .8s linear infinite;-moz-animation:pulse .8s linear infinite;-ms-animation:pulse .8s linear infinite;animation:pulse .8s linear infinite}

@keyframes "pulse"{0%{-webkit-transform:scale(1);-moz-transform:scale(1);-o-transform:scale(1);-ms-transform:scale(1);transform:scale(1)}50%{-webkit-transform:scale(0.8);-moz-transform:scale(0.8);-o-transform:scale(0.8);-ms-transform:scale(0.8);transform:scale(0.8)}100%{-webkit-transform:scale(1);-moz-transform:scale(1);-o-transform:scale(1);-ms-transform:scale(1);transform:scale(1)}}

@-moz-keyframes pulse{0%{-moz-transform:scale(1);transform:scale(1)}50%{-moz-transform:scale(0.8);transform:scale(0.8)}100%{-moz-transform:scale(1);transform:scale(1)}}

@-webkit-keyframes "pulse"{0%{-webkit-transform:scale(1);transform:scale(1)}50%{-webkit-transform:scale(0.8);transform:scale(0.8)}100%{-webkit-transform:scale(1);transform:scale(1)}}

@-ms-keyframes "pulse"{0%{-ms-transform:scale(1);transform:scale(1)}50%{-ms-transform:scale(0.8);transform:scale(0.8)}100%{-ms-transform:scale(1);transform:scale(1)}}

</style>