Angular Bootstrap Modal body content max-size so as not to scroll the whole modal

<!doctype html>
<html ng-app="ui.bootstrap.demo">
  <head>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.16/angular.js"></script>
    <script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11.2.js"></script>
    <script src="example.js"></script>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
 <link href="main.css" rel="stylesheet">
  </head>
  <body>

<div ng-controller="ModalDemoCtrl">

    <button class="btn btn-default" ng-click="open()">Open me!</button>
</div>
  </body>
</html>

angular.module('ui.bootstrap.demo', ['ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('ModalDemoCtrl', function($scope, $modal, $log) {

  $scope.items = function() {
    var a = []
    for (var i = 0; i < 50; i++)
      a.push('item ' + (i + 1))

    return a;
  }()
  $scope.open = function() {


    var modalInstance = $modal.open({
      templateUrl: 'modal.html',
      controller: 'ModalInstanceCtrl',
      windowClass: 'modal-fit',
      resolve: {
        items: function() {
          return $scope.items;
        }
      }
    });

    modalInstance.result.then(function(selectedItem) {
      $scope.selected = selectedItem;
    }, function() {
      $log.info('Modal dismissed at: ' + new Date());
    });
  };
});

// Please note that $modalInstance represents a modal window (instance) dependency.
// It is not the same as the $modal service used above.

angular.module('ui.bootstrap.demo').controller('ModalInstanceCtrl', function($scope, $modalInstance, items) {

  $scope.items = items;
  $scope.selected = {
    item: $scope.items[0]
  };

  $scope.ok = function() {
    $modalInstance.close($scope.selected.item);
  };

  $scope.cancel = function() {
    $modalInstance.dismiss('cancel');
  };
});

<div>
  <div class="modal-header">
    <h3 class="modal-title">I'm a modal!</h3>
  </div>
  <div class="modal-body">
    <ul>
      <li ng-repeat="item in items">
        <a ng-click="selected.item = item">{{ item }}</a>
      </li>
    </ul>
    Selected: <b>{{ selected.item }}</b>
  </div>
  <div class="modal-footer">
    <button class="btn btn-primary" ng-click="ok()">OK</button>
    <button class="btn btn-warning" ng-click="cancel()">Cancel</button>
  </div>
</div>

.modal-fit .modal-dialog {
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  padding: 10px;
}

.modal-fit .modal-body {
  max-height: calc(100vh - 200px);
  overflow: auto;
}