删除无用全局样式

src/styles/element-ui.scss

@@ -17,12 +17,12 @@
 
 
 // to fixed https://github.com/ElemeFE/element/issues/2461
-.el-dialog {
-  transform: none;
-  left: 0;
-  position: relative;
-  margin: 0 auto;
-}
+// .el-dialog {
+//   transform: none;
+//   left: 0;
+//   position: relative;
+//   margin: 0 auto;
+// }
 
 // refine element ui upload
 .upload-container {