解决封面图父容器高度问题

src/views/Editor/Toolbar/ElementTemplateData.vue

@@ -128,11 +128,12 @@
     </div>
 
     <!-- 生成封面图 -->
-    <div style="opacity: 0;position: fixed;left: 100px;top: 0;bottom: 0;overflow: auto;z-index: -1;" 
+    <div style="opacity: 0;position: fixed;left: 100px;top: 0;overflow: auto;z-index: -1;" 
     v-if="model&&model==1&&slides.length>0&&slideIndex>=0">
         <div class="export-img-dialog">
           <div class="thumbnails-view">
-            <div class="thumbnails" ref="FeatureImgRef">
+            <div class="thumbnails FeatureImgRef" ref="FeatureImgRef">
+                
               <ThumbnailSlide 
                 class="thumbnail" 
                 :key="slides[slideIndex].id"