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<!DOCTYPE html>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<style>
body {
margin: 0;
}
button {
width: 100%;
height: calc(100lvh - 100svh);
position: sticky;
background: yellow;
bottom: 0px;
}
</style>
<div style="height: 100svh"></div>
<button></button>