.container .row .col-md-4 h3{
background:#2c3e50;
padding: 50px 50px;
border-radius: 5px;
}
.container .jumbotron{
background: #2c3e50;
}
<!DOCTYPE html>
<html lang="ar" dir="rtl">
<head>
<meta charset="utf-8">
<title> gnu linux algeria </title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" >
</head>
<body>
<style>
body{
box-sizing: border-box;
background: #34495e;
color: #ffffff;
padding: 25px 0;
}
</style>
<div class="container">
<div class="jumbotron">
<h3 class="text-center"> إزاحة الأعمدة بإستخدام صنف col-md-offset </h3>
</div>
<div class="row">
<div class="col-sm-4 col-md-4 col-md-offset-0"> <h3 class="text-center"> العمود 1 </h3> </div>
</div>
<div class="row">
<div class="col-sm-4 col-md-4 col-md-offset-4"> <h3 class="text-center"> العمود 2 </h3></div>
</div>
<div class="row">
<div class="col-sm-4 col-md-4 col-md-offset-8"> <h3 class="text-center"> العمود 3 </h3></div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js">
</script>
</body>
</html>