feat()：修改video对齐

src/components/Upload/SingleImage3.vue

@@ -27,7 +27,7 @@
       <div v-show="coverImg.length>1" class="image-preview-wrapper">
         <img :src="coverImg">
         <div class="image-preview-action">
-          <i class="el-icon-delete" @click="rmImage" />
+          <i v-show="coverImg.length>1" class="el-icon-delete" @click="rmImage" />
         </div>
       </div>
     </div>
@@ -102,7 +102,7 @@ export default {
   position: relative;
   @include clearfix;
   .image-uploader {
-    width: 35%;
+    width: 20%;
     float: left;
   }
   .image-preview {