I am getting error in console that my controller is not registered.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<div>
<h1>Add Your Quotes</h1>
</div>
<div>
<button name=addQuote ng-click = "addQuoteBtn()">Add Quote</button>
</div>
<div ng-if="isVisible">
<textarea rows="4" cols="50" placeholder="Add Quotes Here"></textarea>
</div>
</div>
<script>
var app = angular.module('myApp', []);
app.controller = ('myCtrl', ['$scope', function($scope){
$scope.isVisible = false;
$scope.addQuoteBtn = function(){
$scope.isVisible = true;
}
}]);
</script>
</body>
</html>