function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

function waitForElm(selector) {
    return new Promise(resolve => {
        if (document.querySelector(selector)) {
            return resolve(document.querySelector(selector));
        }

        const observer = new MutationObserver(mutations => {
            if (document.querySelector(selector)) {
                observer.disconnect();
                resolve(document.querySelector(selector));
            }
        });

        // If you get "parameter 1 is not of type 'Node'" error, see https://stackoverflow.com/a/77855838/492336
        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    });
}

waitForElm('footer').then((elm) => {

  // 0->bgcolor, 1->color, 2->image

  const replacements = [
    ['footer', '#e4007c',0],
    ['header__main-menu', '#e4007c',0],
    ['header__title', '#e4007c',1],
    //['primary-bg-wrapper', '#ffe4e1',0],
    ['primary-bg-wrapper', 'https://neptun.bme.hu/oktatoi/App_Themes/Skin_Neptun_Pink/header_right.jpg?fbclid=IwY2xjawQvu8lleHRuA2FlbQIxMQBzcnRjBmFwcF9pZAEwAAEejsSjILW2IucqCqzuuEmt-idaaEp76dLcLqEzWhnOaZUiYjytqglkMrF-8QI_aem_Lkw_NpJhItr0qdkMhEyCmA',2],
  ];

  for (let j = 0; j < replacements.length; j++) {
    var items = document.getElementsByClassName(replacements[j][0]);

    for (let i = 0; i < items.length; i++) {   

      switch (replacements[j][2]) {
      case 0:
        items[i].style.backgroundColor = replacements[j][1];
        break;
      case 1:
        items[i].style.color = replacements[j][1];
        break;
      case 2:
        items[i].style.backgroundImage = 'url(' + replacements[j][1] + ')';
        break;

      }
    }
  }
});