@media screen and (max-width: 599px) {
  header .wp-block-navigation .wp-block-navigation-item {
    justify-content: center;
  }
  header .wp-block-navigation ul{
    width:100%;
  }
  header .wp-block-navigation ul li {
    width: 100%;
    position:relative;
  }
  header .wp-block-navigation ul li .wp-block-navigation-item__content{
    width: 100%;
  }
  header .wp-block-navigation .wp-block-navigation__submenu-icon {
    height: auto;
    width: auto;
    position: absolute;
    padding: 3px;
    right: 0;
    top: 4px;
    left: auto;
  }
  header
    .wp-block-navigation__responsive-container.is-menu-open
    .wp-block-navigation__responsive-container-content
    .has-child
    .wp-block-navigation__submenu-container {
    display: none;
    width: 100%;
  }
  header
    .wp-block-navigation__responsive-container.is-menu-open
    .wp-block-navigation__responsive-container-content
    .wp-block-navigation__submenu-icon {
    display: block;
  }
}