<div class="outer-div">
<div class="inner-div">
<div class="left"></div>
<div class="right"></div>
</div>
</div>
.outer-div{
height: 1000px;
width: 200px;
background-color: purple;
margin: auto;
}
.inner-div {
height: 100px;
width: 100px;
background-color: orange;
margin: auto;
}
.left{
height: 25px;
width: 25px;
background-color: red;
position: fixed;
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.