<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<title>Tags</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/script.js"></script>
</head>
<body>
<div class="container">
<ul class="list-unstyled row teaxhead">
<li class="col-md-6 col-12 custom-control custom-checkbox mb-4" id="Pre-war_content">
<input type="checkbox" class="custom-control-input" id="customCheck_Prewar">
<label class="custom-control-label" for="customCheck_Prewar">Pre-war</label>
</li>
<li class="col-md-6 col-12 custom-control custom-checkbox mb-4" id="Post-war_content">
<input type="checkbox" class="custom-control-input" id="customCheck_Postwar">
<label class="custom-control-label" for="customCheck_Postwar">Post-war</label>
</li>
</ul>
<ul class="list-unstyled row">