Add Floating Back-to-Top button

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How To Create a Scroll To Top Button

Step 1) Add HTML:

Create a button that will take the user to the top of the page when clicked on:

<!-- Sidebar-right.html  -->
<!-- Back to Top -->
  <button onclick="backToTopBtn()" id="backToTopBtn" title="Go to top" class="btn btn-primary">Back to top &uarr;
  </button>

Step 2) Add CSS:

Style the button:

// Floating back to top button

#backToTopBtn { 
    display: block; /* 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: $primary; /* Set a background color */
    color: inherit; /* Text color */
    opacity: 50%;
    cursor: pointer; /* Add a mouse pointer on hover */
    padding: 15px; /* Some padding */
    border-radius:10px;/* Rounded corners */
    font-size:18px;/* Increase font size */
  }
    
#backToTopBtn {
  .text {
    display: inline-block;
  }

  .arrow {
    display: none;
  }

  @media (max-width: 600px) {
    .text {
      display: none;
    }

    .arrow {
      display: inline-block;
    }
  }
}

  #backToTopBtn:hover { 
    background-color: #555; /* Add a dark-grey background on hover */ 
    opacity: 100%;
  }

Add the JavaScript

// assets/js/back-to-top.js

document.addEventListener('DOMContentLoaded', (event) => {
  let mybutton = document.getElementById("backToTopBtn");

  function topFunction() {
    document.body.scrollTop = 0; // For Safari
    document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
    mybutton.style.opacity = "75%";
  }

  if (mybutton) {
    mybutton.onclick = topFunction;
  }

  // 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) {
      mybutton.style.display = "block";
    } else {
      mybutton.style.display = "none";
    }
  }
});

Add the JS source to head

<!-- includes/head.html -->

<!-- Custom JS Scripts -->

<script src="/assets/js/back-to-top.js"></script>