@media (max-width: 600px) {
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation-submenu {
    flex-direction: row !important;
    flex-wrap: wrap;
  }
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__submenu-icon {
    font-size: 1.5em;
  }
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .has-child .wp-block-navigation__submenu-container {
    display: none;
  }
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .has-child.collapsible-active .wp-block-navigation__submenu-icon {
    transform: rotate(180deg);
  }
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .wp-block-navigation__submenu-icon {
    display: block;
  }
  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .has-child .wp-block-navigation__submenu-container {
    width: 100%;
  }
}