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


async function waiting()
{
  while (!document.body.contains(document.getElementById("mat-expansion-panel-header-3"))) {
    sleep(100);
  }
}

//waiting();

console.log('megva');

footer = document.getElementsByClassName('footer');

console.log(footer.length);

for (let i = 0; i < footer.length; i++) {
  footer[i].style.backgroundColor = '#e4007c';
}