<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container col-xs-12 col-sm-offset-2 col-sm-8 col-md-offset-3 col-md-6 col-lg-offset-4 col-lg-4"> <br /> <div class="panel panel-default"> <div class="panel-heading"> <h1>Login</h1> </div> <div class="panel-body"> <div class="form-group"> <div class="input-group"> <span class="input-group-addon"> <i class="glyphicon glyphicon-user" style="width: auto"></i> </span> <input id="txtUsuario" runat="server" type="text" class="form-control" name="user" placeholder="Usuário" required="" /> </div> </div> <div class="form-group"> <div class="input-group"> <span class="input-group-addon"> <i class="glyphicon glyphicon-lock" style="width: auto"></i> </span> <input id="txtSenha" runat="server" type="password" class="form-control" name="password" placeholder="Senha" required="" /> </div> </div> <button id="btnLogin" runat="server" class="btn btn-default" style="width: 100%"> ENTRAR<i class="glyphicon glyphicon-log-in"></i> </button> </div> </div> </div>