Add a white background to the default light theme.

This is needed if a page is in dark mode.

Also fix an npm security vulnerability.

The version is bumped so that this can be published.

Author: drgrice1

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "@openwebwork/pg-codemirror-editor",
-    "version": "0.0.6",
+    "version": "0.0.8",
     "description": "PG CodeMirror Editor",
     "author": "The WeBWorK Project",
     "license": "MIT",

package.json

@@ -1,6 +1,9 @@
 import { tags as t } from '@lezer/highlight';
+import { EditorView } from '@codemirror/view';
 import { HighlightStyle, syntaxHighlighting } from '@codemirror/language';
 
+const lightEditorTheme = EditorView.theme({ '&': { backgroundColor: 'white' } }, { dark: false });
+
 export const lightHighlightStyle = HighlightStyle.define([
     { tag: t.meta, color: '#404740' },
     { tag: t.link, textDecoration: 'underline' },
@@ -25,4 +28,4 @@ export const lightHighlightStyle = HighlightStyle.define([
     { tag: t.invalid, color: '#f00' }
 ]);
 
-export const lightTheme = syntaxHighlighting(lightHighlightStyle, { fallback: true });
+export const lightTheme = [lightEditorTheme, syntaxHighlighting(lightHighlightStyle, { fallback: true })];