@vcl/go-to-top/demo/example.html

A fix positioned control to jump to the top of a scrolled viewport

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.3.1/css/all.css" integrity="sha384-mzrmE5qonljUremFsqc01SB46JvROS7bZs3IO2EmfFsd15uHvIt+Y8vEf7N7fWAU" crossorigin="anonymous">

<div style="position: relative; background-color: gold; height: 7em; position: relative;">
  <button type="button" class="vclGoToTop vclScale120p vclButton vclSquare" title="go to top" style="position: absolute;">
    <div class="vclIcogram">
      <div class="vclIcon fas fa-chevron-up" aria-hidden="true" role="img"></div>
    </div>
  </button>
</div>