.header-nav {
  display: flex;
  gap: 2rem;
}

.nav-item {
  position: relative;
  padding-bottom: 1rem;
}

.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  border: 1px solid #ddd;
  padding: 1rem 0;
  min-width: 25rem;
  z-index: 100;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.submenu a {
  display: block;
  padding: 1rem 2rem;
  text-decoration: none;
  color: #333;
}

.submenu a:hover {
  background-color: #f5f5f5;
}

.nav-item:hover>.submenu {
  display: block;
}
 
@media (max-width: 575px) {
  .header-nav {
    display: none;
  } 
}