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lockBg(newVal) {
  if (newVal) {
    document.documentElement.style.top = -document.body.scrollTop + 'px';
    document.documentElement.classList.add('lock-modal');
  } else {
    document.documentElement.classList.remove('lock-modal');
    document.body.scrollTop = -parseInt(document.getElementsByTagName('html')[0].style.top, 10);
    document.documentElement.style.top = '';
  }
},

html.lock-modal {
  overflow-y: hidden !important;
  position: fixed;
  width: 100%;
}