描述：该案例是使用CSS来描写的，所使用的技术有：linear-gradient线性渐变，animation动画，box-shadow阴影等css3的属性。
效果图：
示例代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>跳动的心</title>
<style>
html,body{
height: 100%;
}
body{
margin: 0;
padding: 0;
background: #ffa5a5;
}
.chest{
width: 500px;
height: 500px;
margin: 0 auto;
position: relative;
}
.heart{
position: absolute;
z-index: 2;
background: linear-gradient(-90deg,#F50A45 0%,#d5093c);
animation: beat 0.7s ease 0s infinite normal;
}
.heart.center{
background: linear-gradient(-45deg,#B80734 0%,#d5093c 40%);
}
.heart.top{
z-index: 3;
}
.side{
top: 100px;
width: 220px;
height: 220px;
border-radius: 110px;
}
.center{
width: 210px;
height: 210px;
bottom: 100px;
left: 145px;
transform: rotateZ(225deg);
}
.left{
left: 62px;
}
.right{
right: 62px;
}
@keyframes beat {
0%{
transform: scale(1) rotate(225deg);
box-shadow: 0 0 40px #d5093c;
}
50%{
transform: scale(1.1) rotate(225deg);
box-shadow: 0 0 70px #d5093c;
}
100%{
transform: scale(1) rotate(225deg);
box-shadow: 0 0 40px #d5093c;
}
}
</style>
</head>
<body>
<div class="chest">
<div class="heart left side top"></div>
<div class="heart center"></div>
<div class="heart right side"></div>
</div>
</body>
</html>