<style> form{ background-color: #fff; margin: 100px auto; max-width: 330px; padding: 15px; -webkit-border-radius: 15px; -moz-border-radius: 15px; border-radius: 15px; } h2 { text-align: center; } .container{ opacity: 0.95; } </style> <div class="container"> <form class="form-signin" action="" method="post"> <h2 class="form-signin-heading">Authentifizierung</h2><br/> <input class="form-control" type="password" name="password" placeholder="Passwort" required><br/> <input class="btn btn-secondary btn-block" type="submit" value="authentifizieren" /><br/> <p><?php echo SessionController::getMsg(0); SessionController::unsetMsg(); ?> </p> </form> </div>