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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
.wrapper{
display: flex;
width: 1000px;
height: 300px;
}
.p1{
flex: 2;
border: 1px solid red;
}
.p2{
border: 1px solid red;
flex: 1;
display: block;
overflow: scroll;
}
.p3{
width: 700px;
height: 200px;
}
</style>
<body>
<div class="wrapper">
<div class="p1"></div>
<div class="p2">
<div class="p3">256</div>
</div>
</div>
</body>
</html>