@media only screen and (min-width: 600px) {
  .page_content-mobile {
    background: url("../_img/clock-paper.jpg");
    background-size: cover;
  }
}

@media only screen and (max-width: 600px) {
  .container-menu-mobile {
    position: fixed;
    bottom: 0;
    z-index: 200;
  }
}