JSFiddle - React, Tailwind, and code Playground

HTML

<div class="pagewrap">
  <p>Scroll down</p>
</div>
<footer>
  <p>Fixed position, behind the .pagewrap element</p>
</footer>

CSS

body {
  margin: 0;
}

.pagewrap {
  background: #FFF;
  width: 100%;
  min-height: 100vh;
  position: relative;
  /*margin-bottom: 64px; /* should be set to = dynamic height of footer*/
  z-index: 1;
}

footer {
  background: #000;
  width: 100%;
  position: sticky;
  display: inline-block;
  bottom: 0;
  left: 0;
  height: auto;
  z-index: 0;
}

footer p {
  color: #FFF;
}