Sonarr/NzbDrone.Web/_backboneApp/Shared/NotificationTemplate.html

<div class="alert alert-{{level}}">
    <button type="button" class="close x-close">×</button>
    <i class="{{iconClass}}" /><strong>{{title}}</strong>
    {{#if isPreFormatted}}
        <pre>{{{preFormattedMessage}}}</pre>
    {{else}}
        {{message}}
    {{/if}}
</div>