sticky form

let form = document.querySelector("#wpcf7-f653-o1");
let formPosition = form.getBoundingClientRect().top + window.scrollY;
let mainNavHeight = document.querySelector('#main-nav').getBoundingClientRect().height;
let formWidth = form.getBoundingClientRect().width;
let formLeft = form.getBoundingClientRect().left;

window.addEventListener('scroll', function() {
    let windowPosition = window.scrollY;

    if (windowPosition >= formPosition) {
        form.style.left = formLeft + 'px';
        form.style.position = 'fixed';
        form.style.top = mainNavHeight + 'px';
        form.style.zIndex = '9999';
        form.style.width = formWidth + 'px';
    } else {
        form.removeAttribute("style");
    }
});