Change Bootstrap navbar width in responsive View using CSS

hi

I use bootstrap for designing website now I want to use navbar menu navbar width surrounds the full screen how I can reduse navbar width.

        <nav class="navbar navbar-default navbar-inverse navbar-fixed-top" role="navigation">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#collapse">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
            </div>
            <div class="collapse navbar-collapse" id="collapse">
            	<ul class="nav navbar-nav">
                	<li><a href="#">Home</a></li>
                	<li><a href="#">About</a></li>
                	<li class="active"><a href="#">Services</a></li>
                	<li><a href="#">Photo Gallery</a></li>
                	<li><a href="#">Contact</a></li>  
                </ul>
            </div>  
        </nav>

Best regards

Neda