diff --git a/src/app/globals.css b/src/app/globals.css
index 9b4f79b..efe06b6 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -314,5 +314,5 @@
 }
 
 .cm-editor {
-  height: 100%;;
-}
\ No newline at end of file
+  height: 100%;
+}
diff --git a/src/app/run/components/Editor.tsx b/src/app/run/components/Editor.tsx
index 5924d5e..ce7b7a3 100644
--- a/src/app/run/components/Editor.tsx
+++ b/src/app/run/components/Editor.tsx
@@ -1,13 +1,14 @@
 "use client";
 
-import CodeMirror, { EditorState } from "@uiw/react-codemirror";
-import { devRun } from "./theme/theme";
+import CodeMirror, { EditorState, EditorView } from "@uiw/react-codemirror";
+import { devRun } from "./theme";
 import { javascript } from "@codemirror/lang-javascript";
 import { rust } from "@codemirror/lang-rust";
 import { go } from "@codemirror/lang-go";
 import { json } from "@codemirror/lang-json";
 import { python } from "@codemirror/lang-python";
 import { java } from "@codemirror/lang-java";
+import { useEffect, useState } from "react";
 
 type Language =
   | "javascript"
@@ -37,12 +38,17 @@ function getLanguageExtension(lang: Language) {
   }
 }
 
-export default function Editor() {
-  return (
-    <CodeMirror
-      readOnly
-      className="h-full w-full"
-      value={`// Import the necessary React library features
+type Move = {
+  latency: number;
+  cursor: number;
+  changes: {
+    from: number;
+    to: number;
+    insert: string;
+  };
+};
+
+const code = `// Import the necessary React library features
 import { createRoot } from 'react-dom/client';
 
 // Define a functional component named "App"
@@ -59,7 +65,72 @@ const domNode = document.getElementById('root');
 
 // Create a root and render your component into the DOM
 const root = createRoot(domNode);
-root.render(<App />); `}
+root.render(<App />);`.repeat(3);
+
+// Helper to split text into chunks of ~4 chars
+function chunkText(text: string, size = 4) {
+  const chunks = [];
+  for (let i = 0; i < text.length; i += size) {
+    chunks.push(text.slice(i, i + size));
+  }
+  return chunks;
+}
+
+const chunks = chunkText(code, 4);
+
+const moves: Move[] = chunks.map((chunk, index) => ({
+  latency: 1, // 100ms per chunk
+  cursor: index * 4, // approximate cursor position
+  changes: {
+    from: index * 4,
+    to: index * 4,
+    insert: chunk,
+  },
+}));
+
+export default function Editor() {
+  const [editorView, setEditorView] = useState<EditorView>();
+
+  useEffect(() => {
+    if (!editorView) return;
+
+    let cancelled = false;
+
+    const executeMove = async (move: Move) => {
+      return new Promise<void>((resolve) => {
+        const timeout = setTimeout(() => {
+          if (!editorView || cancelled) return resolve();
+
+          editorView.dispatch({
+            selection: { anchor: move.cursor },
+            scrollIntoView: true,
+            changes: move.changes,
+          });
+
+          resolve();
+        }, move.latency);
+
+        return () => clearTimeout(timeout);
+      });
+    };
+
+    (async () => {
+      for (const move of moves) {
+        if (cancelled) break;
+        await executeMove(move);
+      }
+    })();
+
+    return () => {
+      cancelled = true; // stop future moves
+    };
+  }, [editorView]);
+
+  return (
+    <CodeMirror
+      readOnly
+      className="h-full w-full"
+      value={``}
       extensions={[
         getLanguageExtension("javascript"),
         EditorState.transactionFilter.of((tr) => {
@@ -72,10 +143,7 @@ root.render(<App />); `}
       theme={devRun}
       onCreateEditor={(view) => {
         view.focus();
-        view.dispatch({
-          selection: { anchor: 1 },
-          scrollIntoView: true,
-        });
+        setEditorView(view);
       }}
     />
   );
diff --git a/src/app/run/components/theme.ts b/src/app/run/components/theme.ts
new file mode 100644
index 0000000..745b9d4
--- /dev/null
+++ b/src/app/run/components/theme.ts
@@ -0,0 +1,119 @@
+import { EditorView } from "@codemirror/view";
+import { HighlightStyle, syntaxHighlighting } from "@codemirror/language";
+import { tags as t } from "@lezer/highlight";
+
+/**
+ * devRun — direct CodeMirror 6 theme
+ * Based on thememirror (dracula), app-integrated
+ */
+export const devRun = [
+  EditorView.theme(
+    {
+      "&": {
+        backgroundColor: "var(--card)",
+        color: "#e6e6eb",
+      },
+
+      ".cm-content": {
+        caretColor: "var(--primary)",
+      },
+
+      ".cm-cursor, .cm-dropCursor": {
+        borderLeftColor: "var(--primary)",
+      },
+
+      "&.cm-focused .cm-selectionBackground, .cm-content ::selection": {
+        backgroundColor: "rgba(120, 120, 150, 0.25)",
+      },
+
+      ".cm-activeLine": {
+        backgroundColor: "rgba(255, 255, 255, 0.03)",
+      },
+
+      ".cm-gutters": {
+        backgroundColor: "var(--card)",
+        color: "rgb(120, 122, 128)",
+        border: "none",
+      },
+
+      ".cm-activeLineGutter": {
+        backgroundColor: "rgba(255, 255, 255, 0.03)",
+      },
+
+      // - Scrollbar -
+      ".cm-scroller": {
+        scrollbarWidth: "thin",
+        scrollbarColor: "rgba(201, 133, 255, 0.3) transparent",
+      },
+    },
+    { dark: true },
+  ),
+
+  syntaxHighlighting(
+    HighlightStyle.define([
+      // Comments — low priority, low contrast
+      {
+        tag: t.comment,
+        color: "#5f6a8a",
+        fontStyle: "italic",
+      },
+
+      // Strings & literals — data, not logic
+      {
+        tag: [t.string, t.special(t.brace)],
+        color: "#f4e58c",
+      },
+
+      // Numbers / booleans — benchmarks & truth
+      {
+        tag: [t.number, t.bool, t.null],
+        color: "#c792ea",
+        fontWeight: "500",
+      },
+
+      // Keywords & operators — decisions & flow
+      {
+        tag: [t.keyword, t.operator],
+        color: "#ff5fa2",
+        fontWeight: "600",
+      },
+
+      // Types & definitions — structure
+      {
+        tag: [t.definitionKeyword, t.typeName],
+        color: "#6be6ff",
+      },
+
+      // Type definitions — neutral, readable
+      {
+        tag: t.definition(t.typeName),
+        color: "#e6e6eb",
+      },
+
+      // Functions, classes, props — execution paths
+      {
+        tag: [
+          t.className,
+          t.definition(t.propertyName),
+          t.function(t.variableName),
+          t.attributeName,
+        ],
+        color: "#4dff9f",
+        fontWeight: "500",
+      },
+
+      // Variables — slightly muted, context-aware
+      {
+        tag: t.variableName,
+        color: "#cfd3dc",
+      },
+
+      // Invalid / errors — instant attention
+      {
+        tag: t.invalid,
+        color: "#ff5555",
+        fontWeight: "700",
+      },
+    ]),
+  ),
+];
diff --git a/src/app/run/components/theme/create-theme.ts b/src/app/run/components/theme/create-theme.ts
deleted file mode 100644
index 661a704..0000000
--- a/src/app/run/components/theme/create-theme.ts
+++ /dev/null
@@ -1,105 +0,0 @@
-import { EditorView } from "@codemirror/view";
-import { Extension } from "@codemirror/state";
-import {
-  HighlightStyle,
-  TagStyle,
-  syntaxHighlighting,
-} from "@codemirror/language";
-
-interface Options {
-  /**
-   * Theme variant. Determines which styles CodeMirror will apply by default.
-   */
-  variant: Variant;
-
-  /**
-   * Settings to customize the look of the editor, like background, gutter, selection and others.
-   */
-  settings: Settings;
-
-  /**
-   * Syntax highlighting styles.
-   */
-  styles: TagStyle[];
-}
-
-type Variant = "light" | "dark";
-
-interface Settings {
-  /**
-   * Editor background.
-   */
-  background: string;
-
-  /**
-   * Default text color.
-   */
-  foreground: string;
-
-  /**
-   * Caret color.
-   */
-  caret: string;
-
-  /**
-   * Selection background.
-   */
-  selection: string;
-
-  /**
-   * Background of highlighted lines.
-   */
-  lineHighlight: string;
-
-  /**
-   * Gutter background.
-   */
-  gutterBackground: string;
-
-  /**
-   * Text color inside gutter.
-   */
-  gutterForeground: string;
-}
-
-const createTheme = ({ variant, settings, styles }: Options): Extension => {
-  const theme = EditorView.theme(
-    {
-      // eslint-disable-next-line @typescript-eslint/naming-convention
-      "&": {
-        backgroundColor: settings.background,
-        color: settings.foreground,
-      },
-      ".cm-content": {
-        caretColor: settings.caret,
-      },
-      ".cm-cursor, .cm-dropCursor": {
-        borderLeftColor: settings.caret,
-      },
-      "&.cm-focused .cm-selectionBackgroundm .cm-selectionBackground, .cm-content ::selection":
-        {
-          backgroundColor: settings.selection,
-        },
-      ".cm-activeLine": {
-        backgroundColor: settings.lineHighlight,
-      },
-      ".cm-gutters": {
-        backgroundColor: settings.gutterBackground,
-        color: settings.gutterForeground,
-      },
-      ".cm-activeLineGutter": {
-        backgroundColor: settings.lineHighlight,
-      },
-    },
-    {
-      dark: variant === "dark",
-    },
-  );
-
-  const highlightStyle = HighlightStyle.define(styles);
-  const extension = [theme, syntaxHighlighting(highlightStyle)];
-
-  return extension;
-};
-
-export default createTheme;
diff --git a/src/app/run/components/theme/theme.ts b/src/app/run/components/theme/theme.ts
deleted file mode 100644
index cf47f3c..0000000
--- a/src/app/run/components/theme/theme.ts
+++ /dev/null
@@ -1,81 +0,0 @@
-import { tags as t } from "@lezer/highlight";
-import createTheme from "./create-theme";
-
-// Original theme: thememirror (dracula)
-export const devRun = createTheme({
-  variant: "dark",
-  settings: {
-    background: "var(--card)", // stays app-integrated
-    foreground: "#e6e6eb",
-    caret: "var(--primary)",
-    selection: "rgba(120, 120, 150, 0.25)",
-    gutterBackground: "var(--card)",
-    gutterForeground: "rgb(120, 122, 128)",
-    lineHighlight: "rgba(255, 255, 255, 0.03)",
-  },
-  styles: [
-    // Comments — low priority, low contrast
-    {
-      tag: t.comment,
-      color: "#5f6a8a",
-      fontStyle: "italic",
-    },
-
-    // Strings & literals — data, not logic
-    {
-      tag: [t.string, t.special(t.brace)],
-      color: "#f4e58c",
-    },
-
-    // Numbers / booleans — benchmarks & truth
-    {
-      tag: [t.number, t.bool, t.null],
-      color: "#c792ea",
-      fontWeight: "500",
-    },
-
-    // Keywords & operators — decisions & flow
-    {
-      tag: [t.keyword, t.operator],
-      color: "#ff5fa2",
-      fontWeight: "600",
-    },
-
-    // Types & definitions — structure
-    {
-      tag: [t.definitionKeyword, t.typeName],
-      color: "#6be6ff",
-    },
-
-    // Type definitions — neutral, readable
-    {
-      tag: t.definition(t.typeName),
-      color: "#e6e6eb",
-    },
-
-    // Functions, classes, props — execution paths
-    {
-      tag: [
-        t.className,
-        t.definition(t.propertyName),
-        t.function(t.variableName),
-        t.attributeName,
-      ],
-      color: "#4dff9f",
-      fontWeight: "500",
-    },
-
-    // Variables — slightly muted, context-aware
-    {
-      tag: t.variableName,
-      color: "#cfd3dc",
-    },
-
-    // Invalid / errors — instant attention
-    {
-      tag: t.invalid,
-      color: "#ff5555",
-      fontWeight: "700",
-    },
-  ],
-});
diff --git a/src/app/run/page.tsx b/src/app/run/page.tsx
index 2a0ea25..850d17a 100644
--- a/src/app/run/page.tsx
+++ b/src/app/run/page.tsx
@@ -1,13 +1,10 @@
 "use client";
 
-import CodeMirror, { EditorState } from "@uiw/react-codemirror";
 import { Card, CardContent } from "@/components/ui/card";
 import RunTimer, { RunInfo } from "./components/RunTimer";
 import RunChat, { ChatMessage } from "./components/RunChat";
 import { FileTree } from "./components/FileTree";
 import { File } from "lucide-react";
-import { devRun } from "./components/theme/theme";
-import { javascript } from "@codemirror/lang-javascript";
 import Editor from "./components/Editor";
 
 export default function Run() {
@@ -53,7 +50,7 @@ export default function Run() {
             <header className="text-sm font-medium text-muted-foreground flex items-center gap-1">
               <File size={16} /> myfile.js
             </header>
-            <div className="flex-1 pt-3 pb-5">
+            <div className="flex-1 pt-3 pb-5 h-full">
               <Editor />
             </div>
           </div>