Ghost/ghost/admin/app/components/announcement-settings/content.hbs

<div class="gh-stack-item {{if (eq @index 0) "gh-setting-first" "gh-setting"}}">
    <div class="flex-grow-1">
        <label class="gh-setting-title gh-theme-setting-title" for={{this.selectId}}>
            Announcement
        </label>
        <div class="gh-announcement-editor">
            <KoenigLexicalEditorInput
                @placeholderText="Breaking news, a big story, a special offer, or any other message"
                @html={{this.content}}
                @onChangeHtml={{this.setContent}}
                @onBlur={{@onChange}}
            />
        </div>
    </div>
</div>