CSS下拉菜单占用整个页面宽度？

Question

我正在处理的页面顶部有一个简单的导航菜单。当您将鼠标悬停在导航菜单上时，我希望导航菜单上的其中一个链接在其下方弹出一个下拉菜单。

我的下拉菜单显示得很好。唯一的问题是下拉菜单项是整个页面的宽度，而不是导航菜单项的宽度。我不确定是什么原因造成的...

这里是导航菜单和下拉菜单的 html 和 css：

.dropdown {
  float: left;
  background-color: #FFF0F5; 
}

.dropDiv {
  position: relative;
  display: inline-block;
  width: 100%;
}

.dropdownContent {
  display: none;
  background-color: #FFF0F5;
  z-index: 1;
  width: 300px;
  overflow-x: hidden;
}

.dropdownContent a {
  display: block;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  width: 300px;
}

.dropdownContent a:hover {
  background-color: #fff8dc;
}

.dropDiv:hover .dropdownContent {
  display: block;
  z-index: 1;
  height: 200px;
  width: 300px;
  overflow-x: hidden;
}

.dropDiv:hover .dropdown {
  background-color: #fff8dc;
}

<nav>
  <ul>
      <li><a href="eiffel.shtml">Eiffel Tower</a></li>
      <li><a href="fashion.shtml">Fashion</a></li>
      <li><a href="food.shtml">Food</a></li>
      <li><a href="museums.shtml">Museums</a></li>
      <div class="dropDiv">
        <li class="dropdown"><a href="history.shtml">History</a></li>
        <div class="dropdownContent">
            <a href=leaders.shtml>Leaders of Paris</a>
            <a href=future.shtml>Future of Paris</a>
        </div>
      </div>
      <li><a href="language.shtml">Language</a></li>
      <li><a href="works.shtml">Works Cited</a></li>
  </ul>
</nav>   

如您所见，这有点乱，因为我一直在添加很多东西，试图想出一些东西来解决这个宽度问题。非常感谢任何帮助！

Answer 1

您的代码对我来说很好用。看起来您的代码中的其他一些 CSS 正在使其全宽。你试过用“！important”或“max-width”修复它吗？

Answer 2

您应该在li 标签中创建dropDiv 并使其成为获取父宽度的绝对位置

nav ul {
  padding:0;
  margin:0;
}
nav ul li {
  list-style: none;
  float: left;
  position: relative;
  margin: 0 5px;
}
nav ul li a{
  color: #000;
  text-decoration: none;
}
.dropdown {
  float: left;
  background-color: #FFF0F5; 
}


nav ul li:hover .dropDiv {
  display: block;
  z-index: 1;
  height: 200px;
  width: 300px;
  overflow-x: hidden;
}

.dropDiv:hover .dropdown {
  background-color: #fff8dc;
}
.dropDiv {
  position: absolute;
  width: 100%;
  display: none;
  background-color: #FFF0F5;
  z-index: 1;
  width: 300px;
  overflow-x: hidden;
}

.dropDiv a {
  display: block;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none; 
}

.dropDiv a:hover {
  background-color: #fff8dc;
}

<nav>
  <ul>
      <li><a href="eiffel.shtml">Eiffel Tower</a></li>
      <li><a href="fashion.shtml">Fashion</a></li>
      <li><a href="food.shtml">Food</a></li>
      <li><a href="museums.shtml">Museums</a></li>
      <li class="dropdown"><a href="history.shtml">History</a>
        <div class="dropDiv">        
          <a href=leaders.shtml>Leaders of Paris</a>
          <a href=future.shtml>Future of Paris</a>
        </div>
      </li>
      <li><a href="language.shtml">Language</a></li>
      <li><a href="works.shtml">Works Cited</a></li>
  </ul>
</nav>

Answer 3

您好，只需根据需要定义导航栏的宽度，我已经定义了 700 像素。并添加一些 css 。检查此代码

.dropdown {
    float: left;
    background-color: #FFF0F5; 
}

.dropDiv {
        position: relative;
    display: inline-block;
    list-style: none;
    padding: 9px;
    float: left;
    max-width: 100%;
	}

.dropdownContent {
    display: none;
    background-color: #FFF0F5;
    z-index: 1;
    width: 300px;
    overflow-x: hidden;
}

.dropdownContent a {
    display: block;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    
}

.dropdownContent a:hover {background-color: #fff8dc;}

.dropDiv:hover .dropdownContent {
    display: block;
    z-index: 1;
    overflow-x: hidden;    
    top: 30px;
    left: 10px;
    position: absolute;
}

.dropDiv:hover .dropdown {
    background-color: #fff8dc;
}
nav {width:700px;float: left;}
nav > ul > li {    float: left;
    padding: 9px;list-style: none}
	ul{float:left;}

<nav>
    <ul>
        <li><a href="eiffel.shtml">Eiffel Tower</a></li>
        <li><a href="fashion.shtml">Fashion</a></li>
        <li><a href="food.shtml">Food</a></li>
        <li><a href="museums.shtml">Museums</a></li>
        <div class="dropDiv">
            <li class="dropdown"><a href="history.shtml">History</a></li>
                <div class="dropdownContent">
                    <a href=leaders.shtml>Leaders of Paris</a>
                    <a href=future.shtml>Future of Paris</a>
                </div>
        </div>
		</li>
        <li><a href="language.shtml">Language</a></li>
        <li><a href="works.shtml">Works Cited</a></li>
    </ul>
</nav>

我想这就是你想要的。