代码如下

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.addBg {
    width: 100px;
    height: 100px;
    background-color: rgba(113,228,250,1);
    border-radius: 100px;
    -webkit-border-radius: 100px;
    position: absolute;
  
}




</style>


</head>
<body>

<div class="addBg scaleAm" ></div>
</body>
</html>

如图

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