<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box{
position: relative;
width: 300px;
height: 300px;
margin: 100px auto;
font-size: 40px;
line-height: 300px;
text-align: center;
color: #fff;
transition: all 1s;
transform-style: preserve-3d;
}
.box:hover{
transform: rotateY(180deg);
}
.front,.back{
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
border-radius: 50%;
}
.front{
background-color: palegoldenrod;
z-index: 1;
}
.back{
background-color: peru;
transform: rotateY(180deg);
}
</style>
</head>
<body>
<div class="box">
<div class="front">front</div>
<div class="back">back</div>
</div>
</body>
</html>
