Added example for changing editor font (#399)

Author: matthewlipski

packages/website/docs/.vitepress/config.ts

@@ -133,6 +133,10 @@ const EXAMPLES_SIDEBAR = [
         text: "Saving & Loading",
         link: "/examples/saving-loading",
       },
+      {
+        text: "Changing Font",
+        link: "/examples/changing-font",
+      },
     ],
   },
   {

packages/website/docs/examples/changing-font.md

@@ -0,0 +1,78 @@
+---
+title: Changing Font
+description: In this example, we change the editor font.
+imageTitle: Changing Font
+path: /examples/changing-font
+---
+
+<script setup>
+import { useData } from 'vitepress';
+import { getTheme, getStyles } from "../demoUtils";
+
+const { isDark } = useData();
+</script>
+
+# Changing Font
+
+In this example, we override some of the default editor CSS to change the font.
+
+**Relevant Docs:**
+
+- [Advanced: Overriding CSS](/docs/theming#advanced-overriding-css)
+
+::: sandbox {template=react-ts}
+
+```typescript-vue /App.tsx
+import "@blocknote/core/style.css";
+import {
+  BlockNoteView,
+  darkDefaultTheme,
+  lightDefaultTheme,
+  Theme,
+  useBlockNote,
+} from "@blocknote/react";
+
+const componentStyles = (theme: Theme) => ({
+  Editor: {
+    '[data-node-type="blockContainer"] *': {
+      fontFamily: "Comic Sans MS",
+    },
+  },
+});
+
+// Default dark theme with additional component styles.
+const theme = {
+  light: {
+    ...lightDefaultTheme,
+    componentStyles,
+  },
+  dark: {
+    ...darkDefaultTheme,
+    componentStyles,
+  },
+} satisfies {
+  light: Theme;
+  dark: Theme;
+};
+
+function App() {
+  const editor = useBlockNote();
+
+  return <BlockNoteView editor={editor} theme={theme} />;
+}
+
+export default App;
+
+```
+
+```css-vue /styles.css [hidden]
+{{ getStyles(isDark) }}
+```
+
+:::
+
+There are several useful CSS selectors that you can use to style different parts of the editor:
+
+- `[data-node-type="blockContainer"]` selects all blocks.
+- `[data-content-type="X"]` selects the content of all blocks of type X (excluding child blocks). Can also have `[data-Y="..."]` attributes for each of the block's props that don't use the default value. E.g. `[data-content-type="heading"][data-level="2"]` will select all heading blocks with heading level 2.
+- `[data-node-type="blockGroup"]` selects all wrapper elements for child blocks.