我的滚动固定导航栏下拉菜单显示不正确

My scrolling fixed navbar drop-down isn't displaying properly

我创建了一个导航栏，当您滚动它时它会停留在页面顶部，但我的下拉菜单无法正常工作。下拉菜单确实显示，但主要内容随后向下移动，并且下拉菜单内容跨越显示宽度。我不得不再次编辑它，因为我的一些代码丢失了......任何帮助将不胜感激。谢谢

        body {
            font-size: 28px;
              }

           ul {
               list-style-type: none;
               margin: 0;
               padding: 0;
                overflow: hidden;
               background-color: #333;
               position: -webkit-sticky; /* Safari */
               position: sticky;
               top: 0;
                  }

                    li {
                     float: left;
                         }

                li a, .dropbtn  {
                  display:  inline-block;
                  color: white;
                  text-align: center;
                    padding: 14px 16px;
                text-decoration: none;
                    }

                li a:hover, .dropdown:hover .dropbtn {
               background-color: #111;
                  }

                .active {
                   background-color: #4CAF50;
                        }
            li.dropdown {
                display: inline-block;
                      }

                  .dropdown-content {
                 display: none;
                 position: sticky;
                 background-color: #f9f9f9;
                  min-width: 160px;
                box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
                  z-index: 1;
                   }

                   .dropdown-content a {
                  color: black;
                  padding: 12px 16px;
                 text-decoration: none;
                 display: block;
                 text-align: left;
                      }

                .dropdown-content a:hover {background-color: #f1f1f1;}

                 .dropdown:hover .dropdown-content {
                   display: block;
                        }

            <!DOCTYPE html>
            <html>
            <head>

             </head>
             <body>

             <div class="header">
             <h2>Scroll Down</h2>
               <p>Scroll down to see the sticky effect.</p>
             </div>

             <ul>
              <li><a class="active" href="#home">Home</a></li>
              <li><a href="#news">News</a></li>
              <li><a href="#contact">Contact</a></li>
              <li class="dropdown">
               <a href="javascript:void(0)" class="dropbtn">Dropdown</a>
             <div class="dropdown-content">
               <a href="#">Link 1</a>
               <a href="#">Link 2</a>
               <a href="#">Link 3</a>
              </div>
              </li>
            </ul>

           <h3>Added text for scrolling</h3>
           <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
           maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
           omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum 
           no molestiae voluptatibus.</p>
           <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
           maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
           omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum 
          no molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. 
         Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae 
         voluptatibus. 
         </p>
 
         </body>
         </html>

您的代码中存在一些问题。

发生的事情是您的下拉菜单将所有内容向下推，因此您应该将其 position 更改为 absolute。

您应该避免使用 float，这是一个坏习惯，而且已经过时了。而是使用flex，现在已经足够支持了。

 body {
            font-size: 28px;
              }

           ul {
               list-style-type: none;
               margin: 0;
               padding: 0;
   
               background-color: #333;
               position: -webkit-sticky; /* Safari */
               position: sticky;
               top: 0;
               
               display: flex;
               align-items: center;
                  }

                li {
                  position: relative
                    }

                li a, .dropbtn  {
                 display: inline-block;
                  color: white;
                  text-align: center;
                    padding: 14px 16px;
                text-decoration: none;
                    }

                li a:hover, .dropdown:hover .dropbtn {
               background-color: #111;
                  }

                .active {
                   background-color: #4CAF50;
                        }
    

                  .dropdown-content {
                 display: none;
                 position: absolute;
                 left: 0;
                 top: 60px;
                 right: 0;
                 background-color: #f9f9f9;
                  min-width: 160px;
                box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
                  z-index: 1;
                   }

                   .dropdown-content a {
                  color: black;
                  padding: 12px 16px;
                 text-decoration: none;
                 display: block;
                 text-align: left;
                      }

                .dropdown-content a:hover {background-color: #f1f1f1;}

                 .dropdown:hover .dropdown-content {
                   display: block;
                        }

  <!DOCTYPE html>
            <html>
            <head>

             </head>
             <body>

             <div class="header">
             <h2>Scroll Down</h2>
               <p>Scroll down to see the sticky effect.</p>
             </div>

             <ul>
              <li><a class="active" href="#home">Home</a></li>
              <li><a href="#news">News</a></li>
              <li><a href="#contact">Contact</a></li>
              <li class="dropdown">
               <a href="javascript:void(0)" class="dropbtn">Dropdown</a>
             <div class="dropdown-content">
               <a href="#">Link 1</a>
               <a href="#">Link 2</a>
               <a href="#">Link 3</a>
              </div>
              </li>
            </ul>

           <h3>Added text for scrolling</h3>
           <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
           maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
           omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum 
           no molestiae voluptatibus.</p>
           <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
           maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
           omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum 
          no molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no 
         molestiae voluptatibus.</p>
         <p>Some text to enable scrolling. Lorem ipsum dolor sit amet, illum definitiones no quo, 
         maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam 
         omnis evertitur eum. 
         Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae 
         voluptatibus. 
         </p>
 
         </body>
         </html>