cmt-engineering-theme/style.css

/*
Theme Name: CMT Engineering Block Theme
Author: Autonomic Co-op
Author URI: https://autonomic.zone
Description: Modern block theme for CMT Engineering
Version: 0.1
*/

/* highlight current/hovered page nav item */
@media screen and (min-width: 786px) {
  .wp-block-navigation .wp-block-navigation-item {
    padding-block: 1em;
    padding-inline: .75em
  }

  .wp-block-navigation .wp-block-navigation-item.current_page_item,
  .wp-block-navigation .wp-block-navigation-item:hover,
  .wp-block-navigation .wp-block-navigation-item:active,
  .wp-block-navigation .wp-block-navigation-item:focus-visible {
    background: var(--wp--preset--color--secondary);
  }
}

@media screen and (max-width: 786px) {
  .hide-on-mobile {
    display: none;
  }

  /* attempt to fix mobile menu */
  .wp-block-navigation-item.open-on-click .wp-block-navigation-submenu__toggle[aria-expanded="false"] ~ ul.wp-block-navigation__submenu-container {
    display: none;
  }

  .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .wp-block-navigation-item {
    font-size: 22px !important;
    text-align: center;
    text-transform: uppercase;
    padding-inline: 1em;
    font-weight: 300;
  }
}