<!DOCTYPE html>
<html>
<head>
<link data-require="bootstrap@3.3.2" data-semver="3.3.2" rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" />
<script data-require="bootstrap@3.3.2" data-semver="3.3.2" src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script data-require="jquery@2.1.3" data-semver="2.1.3" src="http://code.jquery.com/jquery-2.1.3.min.js"></script>
<link href="style.css" rel="stylesheet" />
<script src="script.js"></script>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-4">1</div>
<div class="col-xs-4">2</div>
<div class="col-xs-4">3</div>
</div>
<div class="row">
<div class="col-xs-4">1</div>
<div class="col-xs-4">2</div>
<div class="col-xs-4">3</div>
</div>
<div class="row">
<div class="col-xs-4">1</div>
<div class="col-xs-4">2</div>
<div class="col-xs-4">3</div>
</div>
</div>
</body>
</html>
// Code goes here
/* Styles go here */
.container {
background-color: yellow;
}
.row:nth-child(2) {
border-top: 5px solid red;
border-bottom: 5px solid red;
}
.col-xs-4:nth-child(2) {
border-left: 5px solid red;
border-right: 5px solid red;
}