position: relative;
width: 300px;
height: 200px;
border: 2px solid #ff5722;
}
div.child {position: absolute;
bottom: 20px;
left: 10px;
width: 200px;
height: 70px;
border: 2px solid #ff5722;
}position: sticky;
top: 0;
background-color: #cc5722;
border: 1px solid #ff5722;
}