<style>
  .menu-item-has-children {
    position: relative;
  }

  .menu-item-has-children:hover > .tatsu-sub-menu {
    display: block;
    visibility: visible;
    opacity: 1;
  }

  .tatsu-sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: white;
    box-shadow: 0px 4px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
  }
</style>
