JSFiddle - React, Tailwind, and code Playground

HTML

<div id="heart-container">
    <div id="heart"></div>
</div>

<a href="http://jsfiddle.net/c9yub844/9/" target="_blank">New version with multiple keyframes</a>

CSS

#heart {
    position: relative;
    width: 100px;
    height: 90px;
}
#heart:before,
#heart:after {
    position: absolute;    
	-webkit-animation: heart 1s linear infinite;
    content: "";
    left: 50px;
    top: 0;
    width: 50px;
    height: 80px;
    background: red;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 50px 50px 0 0;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
            transform-origin: 0 100%;
}
#heart:after {
    left: 0;
    -webkit-transform: rotate(45deg);
            transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
}

#heart-container {
    width: 100px;
    height: 90px;
    animation: pulsate 0.5s infinite;
    -webkit-animation: pulsate 0.5s infinite;
}

@keyframes pulsate {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.5);
    }
    100% {
        transform: scale(1);
    }
}

@-webkit-keyframes pulsate {
    0% {
        -webkit-transform: scale(1);
    }
    50% {
        -webkit-transform: scale(1.5);
    }
    100% {
        -webkit-transform: scale(1);
    }
}