style(element-ui.scss): remove global .el-dialog

change .el-dialog to .flow-dialog

src/style/index.scss

@@ -109,3 +109,10 @@ ul {
 .mobile-spacing {
   margin: 0;
 }
+
+.flow-dialog {
+  transform: none;
+  left: 0;
+  position: relative;
+  margin: 0 auto;
+}