i created a simple login form with bootstrap and this is the code:
{% block stylesheets %}
<link href="{{asset('bundles/examens/css/style_ar.css') }}" rel="stylesheet" type="text/css" media="all">
<link href="{{asset('bundles/examens/bootstrap/css/bootstrap.min.css') }}" rel="stylesheet" type="text/css" media="all">
<link href="{{asset('bundles/examens/bootstrap/css/bootstrap.css') }}" rel="stylesheet" type="text/css" media="all">
<link href="{{asset('bundles/examens/bootstrap/css/bootstrap-responsive.min.css') }}" rel="stylesheet" type="text/css" media="all">
<link href="{{asset('bundles/examens/bootstrap/css/bootstrap-responsive.css') }}" rel="stylesheet" type="text/css" media="all">
{% endblock %}
{% if error %}
<div>{{ error.message }}</div>
{% endif %}
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-7">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title"><strong>Sign in </strong></h3>
</div>
<div class="panel-body">
<form class="form-control" action="{{ path('login_check') }}" method="post" role="form">
<div class="form-group">
<label for="username" class="col-sm-3 control-label">Username:</label>
<div class="col-sm-9">
<input type="text" id="username" name="_username" value="{{ last_username }}" />
</div>
</div>
<div class="form-group">
<label for="password" class="col-sm-3 control-label">Password:</label>
<div class="col-sm-9">
<input type="password" id="password" name="_password" />
</div>
</div>
<div class="form-group last">
<div class="col-sm-offset-3 col-sm-9">
<button type="submit" class="btn btn-success btn-sm">login</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
but the problem is that the view of this login page is not like what it should be, it should be like this Login page
but a got a very simple login page without any effects of the classes of bootstrap. where is the problem??