问如何将粘性导航栏添加到网页

EN

                <div id="tab_container">
                    <nav id="tabs">
                        <ul id="nav">
                            <li class="active"><a href="#">About</a></li>
                            <li class="inactive"><a href="#">Services</a></li>
                            <li class="inactive"><a href="#">Our Staff</a></li>
                            <li class="inactive"><a href="#">book</a></li>
                            <li class="inactive"><a href="#">Gift Cards</a></li>
                            <li class="inactive"><a href="#">Reviews</a></li>
                        </ul>
                    </nav>
                </div>

 #tab_container
{
    background-color: #1E1E1E;
    display: -webkit-box;
    -webkit-box-flex: 1;
    display: block;
    position: relative;
    max-width: 970px;
    width: 100%;
    text-align: center;
}

#tabs 
{
    float: left;
    margin-top: 0px;
    width: 100%;
    max-width: 970px;
    background-color: #1E1E1E;
    padding-top: 20px;
    text-align: center;
}

#nav 
{
    width: 100%;
    max-width: 970px;
    text-align: center;
    background-color: #1E1E1E;
}

ul
{
    float: left;
    max-width: 970px;
    display: -webkit-box;
   -webkit-box-flex: 1;
    width: 100%;
    padding-left: 0px;
    margin-bottom: 0px;
    margin-top: 0px;
    margin-right: 0px;
    text-align: center;
    background-color: #1E1E1E;
}

ul li
{
    display: inline-block;
    text-align: center;
    width: 158px;
    height: 70px;
    background-color: #1a1a1a;
    font-size: 18px;
    text-transform: uppercase;
    text-align: center;
    margin:0 auto;
    padding: 0;
}

ul li a
{
    color: #54544b;
    display: block;
    height: 100%;
    width: 100%;
    text-decoration: none;
    text-align: center;
    margin: 0px auto;
    line-height: 70px;

}

a:hover
{ 
    color: #CF7BA1;
}

.active a
{
    text-decoration: underline;
    color: #CF7BA1;
    background-color: #222;
}

$(document).ready(function(){
$('ul#nav li').click(function(){
    var number = $(this).index();
    $('.sec').hide().eq(number).show();
            $(this).toggleClass('active inactive');
    $('ul#nav li').not(this).removeClass('active').addClass('inactive');

});

    $('.sec').not(':first').hide();

});