.book-now-dropdown {
            text-align: right;
            @media screen and (max-width: 1090px) {
                text-align: center;
            }
            height: 40px;
            width: 100%;
            right: 0px;
            position: absolute;
            top: 70px;
            background-color: $b-green;
            transition: 0.2s;
            overflow: visible;
            max-width: 875px;
            transition: top 350ms ease-in-out;
            &.hidden {
                height: 0;
                transition: 0.8s;
                overflow: hidden;
            }
        }
// JS
 window.onscroll = function() {myFunction()};

        // Get the navbar
        var booknow = $("#book-now");
        var position = booknow.position();
        console.log(position);
        // Get the offset position of the navbar
        var sticky = booknow.offset().top;

        // Add the sticky class to the navbar when you reach its scroll position. Remove "sticky" when you leave the scroll position
        function myFunction() {
        var position = booknow.position();

        if (window.pageYOffset >= sticky) {
            booknow.addClass("sticky")
        } else {
            booknow.removeClass("sticky");
        }
    }


 <div class="book-now-dropdown" id="book-now">
            <div id="lodging_box">
                <div id="jrs-widget"></div>
                <script type="text/javascript">
                  (function() {
                    var script = document.createElement('script')
                    script.type = 'text/javascript';
                    script.src = "https://admin.bookdirect.net/hs4/widgets/1283.js?widget_element=jrs-widget";
                    document.body.appendChild(script);
                  })();
                </script>
            </div>
            <div class="book-now-button">
                <a href="#">Search Rooms</a>
            </div>

        </div>

.sticky {
    position: fixed !important;
    top: 0px !important;
    width: 100% !important;
    max-width: 875px !important;
    left: 425px !important;
    // width: 100%
  }