Роман Тузов

let age = prompt('Сколько вам лет?', '')
let message

if (age > 100) {
  alert(`Да ты гигант! Целых(й) ${age} лет(год).`)
} else if (age >= 18) {
  alert('Да ты большой!');
} else if (age < 18) {
  alert('Ещё недорос :)');
}

<meta name="viewport" content="width=device-width, initial-scale=1.0">

document.querySelector('.music-album').addEventListener('click', e => {
  const { target: t, currentTarget: ct } = e;
  const playButton = ct.querySelector('.play_button');
  const stopButton = ct.querySelector('.stop_button');
  const state =
    playButton.contains(t) ?  true :
    stopButton.contains(t) ? false :
                              null;
  if (state !== null) {
    ct.querySelector('audio')[state ? 'play' : 'pause']();
    playButton.style.display = state ? 'none' : 'block';
    stopButton.style.display = state ? 'block' : 'none';
  }
});

.bottom-menu-mobile{
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
}

.main-header{
display:flex;
justify-content: space-between
}
.call{
    -ms-flex-pack: center;
    justify-content: center;
    -ms-flex-direction: column;
    flex-direction: column;
    display: -ms-flexbox;
    display: flex;
}

.main-header {
  justify-content: space-between;
}