monkey
/
1.html

<!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>
</head>
<body>
    <style>
        .box{
            /* overflow: hidden; */
        }
        .left {
            float: left;
            width: 200px;
            background-color: gray;
            height: 400px;
        }
        .right {
            margin-left: 210px;
            background-color: lightgray;
            height: 200px;
        }
        .a{
            width: 100px;
            height: 100px;
            background: pink;
        }
    </style>
    <div class="box">
        <div class="left">左边</div>
        <div class="right">右边
        </div>
    </div>
    <div class="a">1</div>

</body>
</html>