halo-theme-dream2.0-plus/templates/widget/notice.html

<div xmlns:th="https://www.thymeleaf.org"
     th:fragment="widget (sidebar)"
     th:class="'card widget notice ' + ${sidebar.hide} + ' is-hidden-all'">
    <div class="card-title">
        <i th:class="${#strings.defaultString(sidebar.icon, 'ri-volume-up-line') + ' card-title-label'}"></i><span th:text="${#strings.defaultString(sidebar.title, '公告')}"></span>
    </div>
    <div th:if="${#strings.isEmpty(sidebar.content)}" class="card-content">
        <p>&emsp;&emsp;欢迎来访[[${site.title}]]，博主还没有发布任何公告！</p>
    </div>
    <div th:if="${!#strings.isEmpty(sidebar.content)}" th:utext="${sidebar.content}">
    </div>
</div>