document.addEventListener("DOMContentLoaded", function() {
    var iframes = document.querySelectorAll("iframe");

    iframes.forEach(function(iframe) {
        var loader = iframe.parentElement.querySelector(".loader");
        loader.classList.add("active");
        iframe.addEventListener("load", function() {
            loader.classList.remove("active");
            iframe.classList.add("loaded");
        });
    });
    
});