Ghost/core/admin/views/partials/flashes.hbs

{{#if messages}}
    {{#each messages.error}}
        <section class="notification-error js-notification">
          {{.}}
          <a class="close" href="#"><span class="hidden">Close</span></a>
        </section>
    {{/each}}
    {{#each messages.success}}
        <section class="notification-success js-notification">
            {{.}}
            <a class="close" href="#"><span class="hidden">Close</span></a>
        </section>
    {{/each}}
    {{#each messages.warn}}
        <section class="notification-alert js-notification">
            {{.}}
            <a class="close" href="#"><span class="hidden">Close</span></a>
        </section>
    {{/each}}
    {{#each messages.info}}
        <section class="notification js-notification">
            {{.}}
            <a class="close" href="#"><span class="hidden">Close</span></a>
        </section>
    {{/each}}
{{/if}}