<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #box1{ width: 100px; height: 100px;  color: red; border: black 1px solid;
            margin: auto;
            margin-top:20px;
            background-color: aqua;
            padding: 6px;
            position: relative;
            /*border-radius: 100px;*/
            border-radius: 50%;
        }

        #box2{
            width: 50px;
            height: 50px;
            background-color: yellow;
            border: black 1px solid;
            position: absolute;left: 25px;top: 25px;
        ;}
    </style>
</head>
<body>
    <div id="box1">
        <span>kuai</span>
        <div id="box2">块  2</div>
    </div>

</body>
</html>