.sidebar-overlay{
  background: rgba(0, 0, 0, 0.80);
  bottom: 0;
  position: fixed;
  right: 0;
  transition: all .3s ease;
  display: none;
  width: 100%;
  height: 100%;
  z-index: 10;
}

.sidebar-overlay.active-sidebar {
  display: block;
}