导航菜单宽度大小，固定菜单顶部

Question

我是新的CSS，我正在关注为我的网站制作响应菜单的教程。除了几件事情之外，我能够使其工作：导航菜单在桌面和移动视图上缩小。除了大小之外，一切都在工作。此外，只要我编辑显示，位置和z线元素，导航菜单将不会保留在首页上。以下是CSS的代码。感谢您的帮助！

HTML

<div class="container-fluid"> 
      <div class="row"> 
      <div class="col-md-8 col-md-offset-2 col-sm-8 col-sm-offset-2 col-xs-8 col-xs-offset-2"> 
       <div id='cssmenu'> 
     <ul> 
      <li><a href='#intro'>Home</a></li> 
      <li><a href='#features'>About Us</a></li> 
      <li class='active'><a href='#portfolio'>Products and Services</a> 
        <ul> 
         <li><a href='#portfolio'>Product 1 Support</a></li> 
         <li><a href='#portfolio'>Product 2</a></li> 
         <li><a href='#portfolio'>Product 3</a></li> 
         <li><a href='#portfolio'>Product 4</a></li> 
         <li><a href='#portfolio'>Product 5</a></li> 
         <li><a href='#portfolio'>Product 6</a></li> 
        </ul> 
      </li> 
      <li><a href='#team'>Team</a></li> 
      <li><a href='#responsive'>Testimonials</a></li> 
      <li><a href='#contact'>Get In Touch</a></li> 
     </ul> 
    </div> 
      </div> 
      </div> 
     </div> 

CSS

#cssmenu, 
#cssmenu ul, 
#cssmenu ul li, 
#cssmenu ul li a, 
#cssmenu #menu-button { 
    margin: 0; 
    padding: 0; 
    border: 0; 
    list-style: none; 
    line-height: 1; 
    display: block; 
    position: relative; 
    -webkit-box-sizing: border-box; 
    -moz-box-sizing: border-box; 
    box-sizing: border-box; 
} 
#cssmenu:after, 
#cssmenu > ul:after { 
    content: "."; 
    display: block; 
    clear: both; 
    visibility: hidden; 
    line-height: 0; 
    height: 0; 
} 
#cssmenu #menu-button { 
    display: none; 
} 
#cssmenu { 
    font-family: Varela Round, sans-serif; 
    background: #333333; 
} 
#cssmenu > ul > li { 
    float: left; 
} 
#cssmenu.align-center > ul { 
    font-size: 0; 
    text-align: center; 
} 
#cssmenu.align-center > ul > li { 
    display: inline-block; 
    float: none; 
} 
#cssmenu.align-center ul ul { 
    text-align: left; 
} 
#cssmenu.align-right > ul > li { 
    float: right; 
} 
#cssmenu > ul > li > a { 
    padding: 17px; 
    font-size: 12px; 
    letter-spacing: 1px; 
    text-decoration: none; 
    color: #dddddd; 
    font-weight: 700; 
    text-transform: uppercase; 
} 
#cssmenu > ul > li:hover > a { 
    color: #ffffff; 
} 
#cssmenu > ul > li.has-sub > a { 
    padding-right: 30px; 
} 
#cssmenu > ul > li.has-sub > a:after { 
    position: absolute; 
    top: 22px; 
    right: 11px; 
    width: 8px; 
    height: 2px; 
    display: block; 
    background: #dddddd; 
    content: ''; 
} 
#cssmenu > ul > li.has-sub > a:before { 
    position: absolute; 
    top: 19px; 
    right: 14px; 
    display: block; 
    width: 2px; 
    height: 8px; 
    background: #dddddd; 
    content: ''; 
    -webkit-transition: all .25s ease; 
    -moz-transition: all .25s ease; 
    -ms-transition: all .25s ease; 
    -o-transition: all .25s ease; 
    transition: all .25s ease; 
} 
#cssmenu > ul > li.has-sub:hover > a:before { 
    top: 23px; 
    height: 0; 
} 
#cssmenu ul ul { 
    position: absolute; 
    left: -9999px; 
} 
#cssmenu.align-right ul ul { 
    text-align: right; 
} 
#cssmenu ul ul li { 
    height: 0; 
    -webkit-transition: all .25s ease; 
    -moz-transition: all .25s ease; 
    -ms-transition: all .25s ease; 
    -o-transition: all .25s ease; 
    transition: all .25s ease; 
} 
#cssmenu li:hover > ul { 
    left: auto; 
} 
#cssmenu.align-right li:hover > ul { 
    left: auto; 
    right: 0; 
} 
#cssmenu li:hover > ul > li { 
    height: 35px; 
} 
#cssmenu ul ul ul { 
    margin-left: 100%; 
    top: 0; 
} 
#cssmenu.align-right ul ul ul { 
    margin-left: 0; 
    margin-right: 100%; 
} 
#cssmenu ul ul li a { 
    border-bottom: 1px solid rgba(150, 150, 150, 0.15); 
    padding: 11px 15px; 
    width: 170px; 
    font-size: 12px; 
    text-decoration: none; 
    color: #dddddd; 
    font-weight: 400; 
    background: #333333; 
} 
#cssmenu ul ul li:last-child > a, 
#cssmenu ul ul li.last-item > a { 
    border-bottom: 0; 
} 
#cssmenu ul ul li:hover > a, 
#cssmenu ul ul li a:hover { 
    color: #ffffff; 
} 
#cssmenu ul ul li.has-sub > a:after { 
    position: absolute; 
    top: 16px; 
    right: 11px; 
    width: 8px; 
    height: 2px; 
    display: block; 
    background: #dddddd; 
    content: ''; 
} 
#cssmenu.align-right ul ul li.has-sub > a:after { 
    right: auto; 
    left: 11px; 
} 
#cssmenu ul ul li.has-sub > a:before { 
    position: absolute; 
    top: 13px; 
    right: 14px; 
    display: block; 
    width: 2px; 
    height: 8px; 
    background: #dddddd; 
    content: ''; 
    -webkit-transition: all .25s ease; 
    -moz-transition: all .25s ease; 
    -ms-transition: all .25s ease; 
    -o-transition: all .25s ease; 
    transition: all .25s ease; 
} 
#cssmenu.align-right ul ul li.has-sub > a:before { 
    right: auto; 
    left: 14px; 
} 
#cssmenu ul ul > li.has-sub:hover > a:before { 
    top: 17px; 
    height: 0; 
} 
@media all and (max-width: 768px), only screen and (-webkit-min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min--moz-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (-o-min-device-pixel-ratio: 2/1) and (max-width: 1024px), only screen and (min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min-resolution: 192dpi) and (max-width: 1024px), only screen and (min-resolution: 2dppx) and (max-width: 1024px) { 
    #cssmenu { 
    width: 100%; 
    } 
    #cssmenu ul { 
    width: 100%; 
    display: none; 
    } 
    #cssmenu.align-center > ul { 
    text-align: left; 
    } 
    #cssmenu ul li { 
    width: 100%; 
    border-top: 1px solid rgba(120, 120, 120, 0.2); 
    } 
    #cssmenu ul ul li, 
    #cssmenu li:hover > ul > li { 
    height: auto; 
    } 
    #cssmenu ul li a, 
    #cssmenu ul ul li a { 
    width: 100%; 
    border-bottom: 0; 
    } 
    #cssmenu > ul > li { 
    float: none; 
    } 
    #cssmenu ul ul li a { 
    padding-left: 25px; 
    } 
    #cssmenu ul ul ul li a { 
    padding-left: 35px; 
    } 
    #cssmenu ul ul li a { 
    color: #dddddd; 
    background: none; 
    } 
    #cssmenu ul ul li:hover > a, 
    #cssmenu ul ul li.active > a { 
    color: #ffffff; 
    } 
    #cssmenu ul ul, 
    #cssmenu ul ul ul, 
    #cssmenu.align-right ul ul { 
    position: relative; 
    left: 0; 
    width: 100%; 
    margin: 0; 
    text-align: left; 
    } 
    #cssmenu > ul > li.has-sub > a:after, 
    #cssmenu > ul > li.has-sub > a:before, 
    #cssmenu ul ul > li.has-sub > a:after, 
    #cssmenu ul ul > li.has-sub > a:before { 
    display: none; 
    } 
    #cssmenu #menu-button { 
    display: block; 
    padding: 17px; 
    color: #dddddd; 
    cursor: pointer; 
    font-size: 12px; 
    text-transform: uppercase; 
    font-weight: 700; 
    } 
    #cssmenu #menu-button:after { 
    position: absolute; 
    top: 22px; 
    right: 17px; 
    display: block; 
    height: 4px; 
    width: 20px; 
    border-top: 2px solid #dddddd; 
    border-bottom: 2px solid #dddddd; 
    content: ''; 
    } 
    #cssmenu #menu-button:before { 
    position: absolute; 
    top: 16px; 
    right: 17px; 
    display: block; 
    height: 2px; 
    width: 20px; 
    background: #dddddd; 
    content: ''; 
    } 
    #cssmenu #menu-button.menu-opened:after { 
    top: 23px; 
    border: 0; 
    height: 2px; 
    width: 15px; 
    background: #ffffff; 
    -webkit-transform: rotate(45deg); 
    -moz-transform: rotate(45deg); 
    -ms-transform: rotate(45deg); 
    -o-transform: rotate(45deg); 
    transform: rotate(45deg); 
    } 
    #cssmenu #menu-button.menu-opened:before { 
    top: 23px; 
    background: #ffffff; 
    width: 15px; 
    -webkit-transform: rotate(-45deg); 
    -moz-transform: rotate(-45deg); 
    -ms-transform: rotate(-45deg); 
    -o-transform: rotate(-45deg); 
    transform: rotate(-45deg); 
    } 
    #cssmenu .submenu-button { 
    position: absolute; 
    z-index: 99; 
    right: 0; 
    top: 0; 
    display: block; 
    border-left: 1px solid rgba(120, 120, 120, 0.2); 
    height: 46px; 
    width: 46px; 
    cursor: pointer; 
    } 
    #cssmenu .submenu-button.submenu-opened { 
    background: #262626; 
    } 
    #cssmenu ul ul .submenu-button { 
    height: 34px; 
    width: 34px; 
    } 
    #cssmenu .submenu-button:after { 
    position: absolute; 
    top: 22px; 
    right: 19px; 
    width: 8px; 
    height: 2px; 
    display: block; 
    background: #dddddd; 
    content: ''; 
    } 
    #cssmenu ul ul .submenu-button:after { 
    top: 15px; 
    right: 13px; 
    } 
    #cssmenu .submenu-button.submenu-opened:after { 
    background: #ffffff; 
    } 
    #cssmenu .submenu-button:before { 
    position: absolute; 
    top: 19px; 
    right: 22px; 
    display: block; 
    width: 2px; 
    height: 8px; 
    background: #dddddd; 
    content: ''; 
    } 
    #cssmenu ul ul .submenu-button:before { 
    top: 12px; 
    right: 16px; 
    } 
    #cssmenu .submenu-button.submenu-opened:before { 
    display: none; 
    } 
} 

Answer 1

使用位置固定的粘性导航

#cssmenu{ position:fixed; top:0; left:0; right:0; width:100%; }