在CSS问题中导航栏的汉堡包

Question

我正在自己的网站上工作，目前在切换按钮方面存在问题。当我点击汉堡包菜单时，导航栏不会显示。但是切换栏正在工作。我只是做同样的事情，但我只是结合了两个来源，因为概念是相同的。

源代码：

https://www.youtube.com/watch?v=xMTs8tAapnQ

https://www.youtube.com/watch?v=H1eXpp4DAWQ&list=LLU3FO2sJDhxbIBRVc0fA34A&index=2&t=0s

* 
  margin: 0;
  padding: 0;


#toggle 
  display: none;


.hambuger 
  z-index: 1;
  /*keeps displaying the icon when it clicks*/
  position: fixed;
  width: 25px;
  /*The parents (hamburger) of siblings (span)*/
  top: 20px;
  left: 28px;
  cursor: pointer;
  /*to able to click it*/


.line 
  display: block;
  /*to show the three lines*/
  width: 100%;
  /*Maximize the width of the parents (hamburger: 25px width)*/
  height: 3px;
  margin-bottom: 3px;
  /*to separate and see the icons*/
  background-color: black;
  /*color of the icons*/


.menu 
  display: none;
  width: 70px;
  line-height: 1.7em;
  margin: 40px;


.menu a 
  display: block;
  text-decoration: none;
  color: black;
  border: 1px grey solid;


#toggle:checked~.menu 
  display: block;
  /*The toggle became the parents while menu is the sibling here*/

<header class="content">
  <label for="toggle" class="hambuger">
    <input type="checkbox" id="toggle">
    <span class="line"></span>
    <span class="line"></span>
    <span class="line"></span>
  </label>

  <nav class="menu">
    <a href="#" class="active">Home</a>
    <a href="#" class="active">About us</a>
    <a href="#" class="active">History</a>
    <a href="#" class="active">Contacts</a>
  </nav>
</header>