src/app/core/alert/alert.html

<div ng-cloak class="alert alert-{{vm.config.type}}" ng-hide="!vm.show">
    <button type="button" class="close" ng-if="vm.config.closeBtn" ng-click="vm.dismiss()">
        <span aria-hidden="true">&times;</span>
    </button>
    <p ng-transclude></p>
</div>