这个心制作稍微有点难度，关键旋转后的对照
<style type="text/css">
.heart{
width: 200px;
height: 180px;
position: relative;
animation: heartAnimation 2s infinite;
}
.heart::before,.heart::after{
position: absolute;
left: 100px;
top: 0;
width: 100px;
height: 160px;
content: ‘‘;
border-radius: 50px 50px 0 0;
transform-origin: 0 100%;
transform: rotate(-45deg);
}
.heart::after{
transform: rotate(45deg);
transform-origin: 100% 100%;
left: 0;
}
@keyframes heartAnimation{
0%{
transform: scale(.3);
}
20%{
transform: scale(.7);
}
40%{
transform: scale(.9);
}
50%{
transform: scale(1);
}
60%{
transform: scale(.9);
}
80%{
transform: scale(.7);
}
100%{
transform: scale(.3);
}
}
</style>
</head>
<body>
<div class="heart"></div>
</body>
心跳动画
原文：http://www.cnblogs.com/adialike/p/6401033.html
