Html Code of back to Top Button

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
    <script>
    jQuery(document).ready(function() {
    var offset = 220;
    var duration = 500;
    jQuery(window).scroll(function() {
    if (jQuery(this).scrollTop() > offset) {
    jQuery('.back-to-top').fadeIn(duration);
    } else {
    jQuery('.back-to-top').fadeOut(duration);
    }
    });
    jQuery('.back-to-top').click(function(event) {
    event.preventDefault();
    jQuery('html, body').animate({scrollTop: 0}, duration);
    return false;
    })
    });
    </script>
    <style>
    div#page {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    padding: 20px;
    }
    .back-to-top {
    position: fixed;
    bottom: 2em;
    right: 0px;
    text-decoration: none;
    color: #000000;
    background-color: rgba(235, 235, 235, 0.80);
    font-size: 12px;
    padding: 1em;
    display: none;
    }
    .back-to-top:hover {
    background-color: rgba(135, 135, 135, 0.50);
    text-decoration: none;
    }
    </style>
    <a href="#" class="back-to-top">Back to Top</a>