console
<html>
<head>
<meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
</head>
<body>
<div id="outer">
<div id="inner">
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
<p>asdfasdfsadfsadf</p>
</div>
</body>
</html>
#outer{
overflow: hidden;
border-radius: 20px;
}
#inner{
background: red;
height: 200px;
overflow: auto;
}