Bootstrap navbar collapse on custom width

<!doctype html>
<html ng-app="ui.bootstrap.demo">
  <head>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular-animate.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular-sanitize.js"></script>
    <script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-2.5.0.js"></script>
    <script src="example.js"></script>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>

<style>

</style>

<div ng-controller="CollapseDemoCtrl">
	<p>Resize window to less than 1000 pixels to display mobile menu toggle button.</p>
	<nav class="navbar navbar-default" role="navigation">
		<div class="navbar-header">
			<button type="button" class="navbar-toggle" ng-click="isNavCollapsed = !isNavCollapsed">
				<span class="sr-only">Toggle navigation</span>
				<span class="icon-bar"></span>
				<span class="icon-bar"></span>
				<span class="icon-bar"></span>
			</button>
			<a class="navbar-brand" href="#">A menu</a>
		</div>
		<div class="collapse navbar-collapse" uib-collapse="isNavCollapsed">
			<ul class="nav navbar-nav">
				<li><a href="#">Link 1</a></li>
				<li><a href="#">Link 2</a></li>
			</ul>
		</div>
	</nav>
	
</div>
  </body>
</html>

angular.module('ui.bootstrap.demo', ['ngAnimate', 'ngSanitize', 'ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('CollapseDemoCtrl', function ($scope) {
  $scope.isNavCollapsed = true;
  $scope.isCollapsed = false;
  $scope.isCollapsedHorizontal = false;
});

@media (max-width: 1000px) {
    .navbar-header {
        float: none;
    }
    .navbar-left,.navbar-right {
        float: none !important;
    }
    .navbar-toggle {
        display: block;
    }
    .navbar-collapse {
        border-top: 1px solid transparent;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    }
    .navbar-fixed-top {
        top: 0;
        border-width: 0 0 1px;
    }
    .navbar-collapse.collapse {
        display: none!important;
    }
    .navbar-nav {
        float: none!important;
        margin-top: 7.5px;
    }
    .navbar-nav>li {
        float: none;
    }
    .navbar-nav>li>a {
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .collapse.in{
        display:block !important;
    }
}