Scroll to top button

scroll_to_top.js

/* button onClick="ga('send', 'event', 'btn_scroll', 'click', 'scroll_to_top')"  */
 <button onclick="topFunction()" id="myBtn" title="Go to top">NHẬN ƯU ĐÃI NGAY</button>

/* CSS */
#myBtn {
    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: #63BE9E; /* Set a background color */
    color: white; /* Text color */
    cursor: pointer; /* Add a mouse pointer on hover */
    padding: 10px; /* Some padding */
    border-radius: 8px; /* Rounded corners */
    font-size: 18px; /* Increase font size */
}

#myBtn:hover {
    background-color: #555; /* Add a dark-grey background on hover */
}

/* JS */
// 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("myBtn").style.display = "block";
    } else {
        document.getElementById("myBtn").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
}

cool