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我使用的是引导选项卡标记，如下图所示：添加边框环绕引导标签
.nav-tabs {
&.nav-tabs-alt {
padding-top: 30px;
li {
a {
color: @brand-info;
font-size: 16px;
}
}
li.active {
a {
background-color: #fff;
color: @brand-primary !important;
font-size: 16px;
}
}
}
}
.tab-content {
&.tab-content-alt {
}
}<!DOCTYPE html>
<html lang="">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title Page</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
</head>
<body>
<div>
<!-- Nav tabs -->
<ul class="nav nav-tabs nav-tabs-alt" role="tablist">
<li role="presentation" class="active"><a href="#call" aria-controls="home" role="tab" data-toggle="tab">Call Us</a></li>
<li role="presentation"><a href="#email" aria-controls="profile" role="tab" data-toggle="tab">Email Us</a></li>
</ul>
<!-- Tab panes -->
<div class="tab-content tab-content-alt">
<div role="tabpanel" class="tab-pane fade in active" id="call">...</div>
<div role="tabpanel" class="tab-pane fade" id="email">...</div>
</div>
</div>
<script src="http://code.jquery.com/jquery.js"></script>
<!-- Bootstrap JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
</body>
</html>不过，我想，如果一个边框包围的整个标签，如下图所示，但在我的例子中，边界不是流动的，并且有一个中断。任何想法如何实现这个结果？
.nav-tabs {
&.nav-tabs-alt {
padding-top: 30px;
li {
a {
color: @brand-info;
font-size: 16px;
}
}
li.active {
a {
background-color: #fff;
color: @brand-primary !important;
font-size: 16px;
}
}
}
}
.tab-content.tab-content-alt {
border-right: 1px solid #ddd;
border-left: 1px solid #ddd;
border-bottom: 1px solid #ddd;
border-top-color:transparent;
border-radius: 4px;
}
}<!DOCTYPE html>
<html lang="">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title Page</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
</head>
<body>
<div>
<!-- Nav tabs -->
<ul class="nav nav-tabs nav-tabs-alt" role="tablist">
<li role="presentation" class="active"><a href="#call" aria-controls="home" role="tab" data-toggle="tab">Call Us</a></li>
<li role="presentation"><a href="#email" aria-controls="profile" role="tab" data-toggle="tab">Email Us</a></li>
</ul>
<!-- Tab panes -->
<div class="tab-content tab-content-alt">
<div role="tabpanel" class="tab-pane fade in active" id="call">...</div>
<div role="tabpanel" class="tab-pane fade" id="email">...</div>
</div>
</div>
<script src="http://code.jquery.com/jquery.js"></script>
<!-- Bootstrap JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
</body>
</html>