原理：两个div，一个左旋转 一个右旋转或左旋转后镜像，分别圆角一半
<html>
<head>
<meta charset="UTF-8">
<title>红心</title>
<style type="text/css">
*{
padding: 0px;
margin: 0px;
}
.box{
position:relative;
width: 200px;
height: 300px;
background-color: #fff;
margin: 100px auto;
}
.uai,.hh{
position: absolute;
left: 0px;
top: 0px;
width: 200px;
height: 300px;
background-color:red;
border-radius:100px 100px 0 0;
transform: rotate(-45deg);
color: white;
line-height: 100px;
text-align: center;
font-size:30px;
}
.hh{
transform: rotate(45deg) translateX(50px) translateY(-50px);
}
</style>
</head>
<body>
<div class="box">
<div class="uai">Uai</div>
<div class="hh">HH</div>
</div>
</body>
</html>
