function buildPreviewA() {
            return `
                <!-- 표지 -->
                <div class="preview-a4">
                    <div class="pad">
                        <div class="cover-top">[날짜]<br>[작성자]</div>
                        <div class="cover-center">
                        <div class="cover-title">[제목]</div>
                        <div class="cover-sub">[부제]</div>
                        </div>
                    </div>
                </div>