순수 CSS를 사용하여 반응형 탐색 모음의 드롭다운 상자 효과를 구현하는 단계

<nav class="navbar">
  <div class="navbar-brand">Logo</div>
  <input type="checkbox" id="toggle" class="toggle-checkbox">
  <label for="toggle" class="toggle-label">
    <span class="toggle-icon"></span>
  </label>
  <ul class="navbar-menu">
    <li>菜单项1</li>
    <li>菜单项2</li>
    <li>菜单项3</li>
    <li>菜单项4</li>
    <li>菜单项5</li>
  </ul>
</nav>

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333;
  color: #fff;
  padding: 10px;
}

.navbar-brand {
  font-size: 20px;
}

.toggle-label {
  display: none;
  cursor: pointer;
}

.toggle-icon {
  display: inline-block;
  width: 30px;
  height: 5px;
  background-color: #fff;
  margin-bottom: 5px;
}

.navbar-menu {
  display: flex;
  list-style-type: none;
}

.navbar-menu li {
  margin-left: 10px;
}

@media screen and (max-width: 768px) {
  .navbar-menu {
    display: none;
  }

  .toggle-label {
    display: inline-block;
  }

  .toggle-checkbox:checked ~ .navbar-menu {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 45px;
    background-color: #333;
    width: 100%;
  }

  .toggle-checkbox:checked ~ .navbar-menu li {
    margin-left: 0;
  }
}