Fix .css import

src/components/MarkdownEditorWidget.scss

@@ -0,0 +1 @@
+@import "~react-mde/lib/styles/css/react-mde-all.css";

src/components/MarkdownEditorWidget.tsx

@@ -1,9 +1,9 @@
 import React from "react";
 import styled from "styled-components";
 import ReactMde from "react-mde";
-import "react-mde/lib/styles/css/react-mde-all.css";
 import ReactMarkdown from "react-markdown";
 import { WidgetProps } from "react-jsonschema-form";
+import "./MarkdownEditorWidget.scss"
 
 type MarkdownEditorWidgetProps = Omit<WidgetProps, "options"> & {
   options: any;