fix: 答案导出bug

src/modules/card/assets/styles/card-design.scss

@@ -609,13 +609,13 @@
 
 // design-preview-frame
 .design-preview-frame {
-  position: absolute;
+  position: fixed;
   width: 1000px;
   height: 600px;
   left: -9999px;
-  top: 0;
+  top: -9999px;
   z-index: 1001;
-  visibility: hidden;
+  // visibility: hidden;
 }
 // card-build-frame
 .card-build-frame {

src/modules/questions/views/GenPaper.vue

@@ -443,7 +443,7 @@
       v-if="paperJson"
       ref="AnswerTemplateView"
       id="answer-template-view"
-      class="preview-body"
+      class="preview-body design-preview-frame"
       :answerData="paperJson"
       :pageCountMode="pageCountMode"
       @rend-finished="rendFinished"