这是一款基于bootstrap的选项卡。该选项卡的tab被设计在底部，通过简单的CSS代码来对其进行美化，效果非常不错。

使用方法

在页面中引入下面的文件。

<link rel="stylesheet" href="bootstrap.min.css" />
<script src="jquery.min.js"></script>
<script src="bootstrap.min.js"></script>
HTML结构
&t;div class="container"gt;
    &t;div class="row"gt;
        &t;div class="col-md-6"gt;
            &t;div class="tab" role="tabpanel"gt;
                &t;!-- Tab panes --gt;
                &t;div class="tab-content"gt;
                    &t;div role="tabpanel" class="tab-pane fade in active" id="Section1"gt;
                        &t;pgt;Lorem ipsum dolor sit amet, consectetur adipiscing elit. ... &t;/pgt;
                        &t;h3gt;Web Development&t;/h3gt;
                    &t;/divgt;
 
                    &t;div role="tabpanel" class="tab-pane fade" id="Section2"gt;
                        &t;pgt;Lorem ipsum dolor sit amet, consectetur adipiscing elit. ... &t;/pgt;
                        &t;h3gt;Brand Building&t;/h3gt;
                    &t;/divgt;
 
                    &t;div role="tabpanel" class="tab-pane fade" id="Section3"gt;
                        &t;pgt;Lorem ipsum dolor sit amet, consectetur adipiscing elit.... &t;/pgt;
                        &t;h3gt;Responsive Design&t;/h3gt;
                    &t;/divgt;
 
                    &t;div role="tabpanel" class="tab-pane fade" id="Section4"gt;
                        &t;pgt;Lorem ipsum dolor sit amet, consectetur adipiscing elit. ... &t;/pgt;
                        &t;h3gt;Clean & Clear Design&t;/h3gt;
                    &t;/divgt;
                &t;/divgt;
                &t;!-- Nav tabs --gt;
                &t;ul class="nav nav-tabs" role="tablist"gt;
                    &t;li role="presentation" class="active"gt;&t;a href="#Section1" aria-controls="home" role="tab" data-toggle="tab"gt;Section 1&t;/agt;&t;/ligt;
                    &t;li role="presentation"gt;&t;a href="#Section2" aria-controls="profile" role="tab" data-toggle="tab"gt;Section 2&t;/agt;&t;/ligt;
                    &t;li role="presentation"gt;&t;a href="#Section3" aria-controls="messages" role="tab" data-toggle="tab"gt;Section 3&t;/agt;&t;/ligt;
                    &t;li role="presentation"gt;&t;a href="#Section4" aria-controls="settings" role="tab" data-toggle="tab"gt;Section 4&t;/agt;&t;/ligt;
                &t;/ulgt;
            &t;/divgt;
        &t;/divgt;
    &t;/divgt;
&t;/divgt;
CSS样式
a:hover,a:focus{
    outline: none;
    text-decoration: none;
}
.tab .nav-tabs{
    box-shadow: -1px 0 2px #6676ff;
    border-bottom: 0 none;
}
.tab .nav-tabs li{
    width: 25%;
}
.tab .nav-tabs li a{
    display: block;
    font-size: 14px;
    color: #fff;
    text-align: center;
    border: none;
    padding: 18px;
    background: #272e38;
    border-radius: 0;
    margin: 0;
    position: relative;
    transition: all 0.3s ease 0s;
}
.tab .nav-tabs li a:hover{
    background: #6676ff;
}
.tab .nav-tabs li.active a,
.tab .nav-tabs li.active a:focus,
.tab .nav-tabs li.active a:hover{
    border: none;
    background: #6676ff;
    color: #fff;
    transition: all 0.20s ease 0s;
}
.tab .nav-tabs li.active a:after{
    content: "";
    position: absolute;
    top: -30px;
    left: 38%;
    border: 15px solid transparent;
    border-bottom-color: #6676ff;
}
.tab .tab-content{
    font-size: 14px;
    color: #fff;
    background: #333;
    line-height: 25px;
    padding: 20px;
}
.tab .tab-content h3{
    font-size: 20px;
    color: #6676ff;
}
@media only screen and (max-width: 480px){
    .tab .nav-tabs li{
        width: 100%;
        margin-bottom: 2px;
    }
    .tab .nav-tabs li.active a:after{
        border: none;
    }
}