img{ width: 100%; height: auto; }
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title> Free Software and Gnu Linux Algeria </title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" > </head> <body> <div class="container"> <h3 class="text-center"> في البوتستراب 3 <code>.img-responsive</code> مثال على إستخدام صنف الـ </h3> <br> <div class="col-sm-6 col-sm-offset-3"> <img src="https://images.pexels.com/photos/449627/pexels-photo-449627.jpeg?auto=compress&cs=tinysrgb&h=650&w=940" class="img-responsive" > </div> </div> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> </body> </html>