const callback = function(mutationsList, observer) {    const targetDiv = document.querySelector('.min-w-0.mx-auto.w-full.max-w-2xl');    if (targetDiv && !targetDiv.classList.contains('max-w-full')) {        console.log('adding class...');        targetDiv.classList.add('max-w-full');        observer.disconnect();     }};const observer = new MutationObserver(callback);const config = { childList: true, subtree: true };observer.observe(document.body, config);