@media (max-width: 576px) {
  html, body {
    width: 100% !important;
    max-width: 100% !important;
    overflow-x: hidden; /* avoid any residual horizontal scroll */
  }
  .section,
  .section > .container,
  .navbar-menu,
  .navbar-menu > .container {
    width: 100% !important;
    max-width: 100% !important;
  }
}