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<!DOCTYPE html>
<style>
body,html {
margin: 0;
width: 100%;
height: 100%;
}
.sticky {
background: green;
position: sticky;
bottom: 50vh;
width: 100px;
height: 10%;
}
.spacer {
height: 90%;
}
.long {
height: 600vh;
}
.position-parent {
position: absolute;
display: flex;
align-items: center;
justify-content: center;
width: 100%;
height: 100%;
top: 100vh;
background-color: lightgrey;
}
.container {
width: 100px;
height: 100%;
background-color: grey;
}
button {
position: fixed;
left: 20px;
top: 20px;
}
.fixed {
position: fixed;
top: 25vh;
}
</style>
<div class="position-parent">
<div class="container">
<div class="spacer"></div>
<div class="sticky"></div>
</div>
</div>
<div class="long"></div>
<button id="button">Toggle Fixed</button>
</html>