Html 如何使导航菜单栏水平滚动

我有一个导航条，上面有几个li标签，在较小的屏幕上，这些标签会相互重叠。我希望导航栏保持相同的高度，在较小的设备屏幕上水平滚动，但我尝试的一切都不起作用。有人能告诉我这里出了什么问题吗

HMTL：

---

但这目前不起作用。

水平滚动菜单移动

 <style type="text/css">
    @media screen and (max-width : 480px){
      div.menu ul {
         display: inline-block;
         width: 85%;
        display: inline-block;
        padding-bottom:20px;
        white-space: nowrap;
        overflow-y: hidden;
        overflow-x: scroll; 
        -webkit-overflow-scrolling: touch; 
        -ms-overflow-style: -ms-autohiding-scrollbar;
      }
      div.menu li {
          display: inline-block; 
       }
      div.menu li a {
        text-align: center;
      }
    }
    </style>
    <nav role="navigation" class="site-navigation main-navigation">
      <div class="menu">
        <ul>
          <li class="page_item page-item-40"><a href="http://localhost/property_abba/for-sale/">Buy</a></li>
          <li class="page_item page-item-41"><a href="http://localhost/property_abba/for-rent/">Rent</a></li>
          <li class="page_item page-item-7"><a href="http://localhost/property_abba/sell/">Sell</a></li>
          <li class="page_item page-item-9 current_page_item"><a href="http://localhost/property_abba/valuations/">Valuations</a></li>
          <li class="page_item page-item-15"><a href="http://localhost/property_abba/property-management/">Property Management</a></li>
          <li class="page_item page-item-11"><a href="http://localhost/property_abba/about-us/">About Us</a></li>
          <li class="page_item page-item-13"><a href="http://localhost/property_abba/contact-us/">Contact Us</a></li>
        </ul>
      </div>
    </nav>

@媒体屏幕和屏幕（最大宽度：480px）{
分区菜单{
显示：内联块；
宽度：85%；
显示：内联块；
垫底：20px；
空白：nowrap；
溢出y：隐藏；
溢出-x：滚动；
-webkit溢出滚动：触摸；
-ms溢出样式：-ms自动隐藏滚动条；
}
李宗宪{
显示：内联块；
}
菜单a区{
文本对齐：居中；
}
}

@media screen and (max-width : 480px){
  div.menu ul {
    display: inline-block;
    max-height: 34px;
    overflow: auto;
    white-space: nowrap;
  }
  div.menu a {
    display: inline-block;
    text-align: center;
  }
}

 <style type="text/css">
    @media screen and (max-width : 480px){
      div.menu ul {
         display: inline-block;
         width: 85%;
        display: inline-block;
        padding-bottom:20px;
        white-space: nowrap;
        overflow-y: hidden;
        overflow-x: scroll; 
        -webkit-overflow-scrolling: touch; 
        -ms-overflow-style: -ms-autohiding-scrollbar;
      }
      div.menu li {
          display: inline-block; 
       }
      div.menu li a {
        text-align: center;
      }
    }
    </style>
    <nav role="navigation" class="site-navigation main-navigation">
      <div class="menu">
        <ul>
          <li class="page_item page-item-40"><a href="http://localhost/property_abba/for-sale/">Buy</a></li>
          <li class="page_item page-item-41"><a href="http://localhost/property_abba/for-rent/">Rent</a></li>
          <li class="page_item page-item-7"><a href="http://localhost/property_abba/sell/">Sell</a></li>
          <li class="page_item page-item-9 current_page_item"><a href="http://localhost/property_abba/valuations/">Valuations</a></li>
          <li class="page_item page-item-15"><a href="http://localhost/property_abba/property-management/">Property Management</a></li>
          <li class="page_item page-item-11"><a href="http://localhost/property_abba/about-us/">About Us</a></li>
          <li class="page_item page-item-13"><a href="http://localhost/property_abba/contact-us/">Contact Us</a></li>
        </ul>
      </div>
    </nav>