Javascript for placing masterslide on top not working

Thank you. I will look into it.

I modified the script and used this one and it seems to do the trick

function bringHeaderToFront() {
    var header = document.querySelector('[data-acc-text="header"]');
    if (header) {
        header.style.zIndex = "9999"; 
        console.log("Header found and zIndex updated");
    } else {
        console.log("Header not found");
    }
}

// Run on first slide load
bringHeaderToFront();

// Also detect when a new slide loads
var observer = new MutationObserver(function() {
    bringHeaderToFront();
});

observer.observe(document.body, { childList: true, subtree: true });