Tạo hiệu ứng Widget cuộn theo trang - XEM

Thêm code để tạo hiệu ứng Sticky  cho widget mà bạn muốn

<script>
// Sticky widget by namkna.blogspot.com
// Tutorial at http://namkna.blogspot.com/2013/10/tao-sticky-cho-nhieu-widget-cua-blogspot.html
// Free to use or share, but please keep this notice intact.
//<![CDATA[
bs_makeSticky("HTML10");
function bs_makeSticky(elem) {
    var bs_sticky = document.getElementById(elem);
    var scrollee = document.createElement("div");
    bs_sticky.parentNode.insertBefore(scrollee, bs_sticky);
    var width = bs_sticky.offsetWidth;
    var iniClass = bs_sticky.className + ' bs_sticky';
    window.addEventListener('scroll', bs_sticking, false);
    function bs_sticking() {
        var rect = scrollee.getBoundingClientRect();
        if (rect.top < 0) {
            bs_sticky.className = iniClass + ' bs_sticking';
            bs_sticky.style.width = width + "px";
        } else {
            bs_sticky.className = iniClass;
        }
    }
}
//]]>
</script>

<style>
.bs_sticking {background:#f2f2f2 !important; position:fixed !important; top:0; z-index:9999; box-shadow:0px 10px 4px -5px rgba(0,0,0,0.3); margin-top: 0; position:relative\9 !important;}
</style>