<!DOCTYPE html>
<style>
#absolute {
position: absolute;
background-color: chartreuse;
top: 100px;
left: 100px;
width: 200px;
height: 20px;
}
#fixed {
background-color: salmon;
width: 50px;
height: 20px;
}
#overlap {
position:absolute;
background-color: pink;
top: 0;
left: 0;
height: 75px;
width: 75px;
}
</style>
<div id="overlap"></div>
<div id="absolute">
<div id="fixed"></div>
</div>