console
<!DOCTYPE >
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.root{
width: 800px;
height: 500px;
margin: 0 auto;
position: relative;
}
.root div{
width: 100px;
height: 200px;
background-color: red;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
margin: auto;
}
.one{
transform: rotateZ(-45deg) translate(28px,28px);
transform-origin: right bottom;
border-radius: 80px 80px 0 0;
}
.two{
transform: rotateZ(45deg);
border-radius: 80px 80px 0 0;
transform-origin: left bottom;
}
</style>
</head>
<body>
<div class="root">
<div class="one"></div>
<div class="two"></div>
</div>
</body>
</html>