.menu::before {
  display: flex;
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(180deg, #0000008c 0%, #0000008c 100%),
    url("../img/dog-p.jpg");
  background-size: cover;
  z-index: -1;
}

@media (max-width: 600px) {
  .menu::before {
    display: flex;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(180deg, #0000008c 0%, #0000008c 100%),
      url("../img/dog-p.jpg");
    background-size: cover;
    z-index: -1;
  }
}