function move(event) {
  if (!mmedia.paused && !mmedia.ended) {
    let mouseX = event.offsetX - 2;
    if (mouseX < 0) {
      mouseX = 0;
    } else if (mouseX > maxim) {
      mouseX = maxim;
    }
    const newtime = mouseX * mmedia.duration / maxim;
    mmedia.currentTime = newtime;
    progress.style.width = mouseX + "px";
  }
}