resize
<style>
.father {
padding: 20px;
width: 200px;
height: 50px;
max-width: 800px;
max-height: 800px;
border: 1px solid #000;
overflow: auto;
resize: both;
}
.son {
width: 50px;
height: 20px;
padding: 100px;
background-color: aqua;
}
</style>
<div >
<div >1123</div>
</div>
