how do I make a class display block with checkbox

I can get it to work it works with toggle:checked {display: none} bet not with extra class can some won plz help me with dis problem.

 nav>
        <div class="nav">
          <label class="hamburger__menu" for="toggle">&#9776</label>
          <input class="toggle" type="checkbox" id="toggle">
        </div>

        <div class="menu-box">
          <ul class="menu">
            <li class="menu__item"><a class="item__link" href="#">home</a></li>
            <li class="menu__item menu__item--yellow"><a class="item__link" href="#">humo@festivals</a></li>
            <li class="menu__item"><a class="item__link" href="#">humor</a></li>
            <li class="menu__item menu__item--red"><a class="item__link" href="#">video</a></li>
            <li class="menu__item"><a class="item__link" href="#">fotospecials</a></li>
            <li class="menu__item"><a class="item__link" href="#">nu in humo</a></li>
            <li class="menu__item"><a class="item__link" href="#">tv/film</a></li>
            <li class="menu__item"><a class="item__link" href="#">actua</a></li>
            <li class="menu__item"><a class="item__link" href="#">muziek</a></li>
            <li class="menu__item"><a class="item__link" href="#">boeken</a></li>
            <li class="menu__item"><a class="item__link" href="#">humo sapiens</a></li>
          </ul>
        </div>
      </nav>

.menu {
  display: none;
}

.toggle {
  display: none;

  &:checked + .menu {
    display: block;
  }
}