scrolltop.html

<style>
#scrolltop {
  display: none; /* Hidden by default */
  position: fixed; /* Fixed/sticky position */
  bottom: 20px; /* Place the button at the bottom of the page */
  right: 30px; /* Place the button 30px from the right */
  z-index: 99; /* Make sure it does not overlap */
  border: none; /* Remove borders */
  outline: none; /* Remove outline */
  background-color: {{ site.color }}; /* Set a background color */
  color: white; /* Text color */
  cursor: pointer; /* Add a mouse pointer on hover */
  padding: 10px 15px; /* Some padding */
  border-radius: 100px; /* Rounded corners */
  font-size: 18px; /* Increase font size */
  font-weight: 600;
}

#scrolltop:hover {
  background-color: #555; /* Add a dark-grey background on hover */
}
</style>
<button onclick="topFunction()" id="scrolltop" title="Go to top">🔝</button>

<script>
// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {scrollFunction()};

function scrollFunction() {
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    document.getElementById("scrolltop").style.display = "block";
  } else {
    document.getElementById("scrolltop").style.display = "none";
  }
}

// When the user clicks on the button, scroll to the top of the document
function topFunction() {
  document.body.scrollTop = 0; // For Safari
  document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}
</script>