diff --git a/client/src/app.css b/client/src/app.css
index bf75faf..2e70b8b 100644
--- a/client/src/app.css
+++ b/client/src/app.css
@@ -83,3 +83,11 @@ code {
 .app-content {
   flex: 1;
 }
+
+.markdown li ul, .markdown li ol {
+	margin:0 1.5em;
+}
+
+.markdown ul, .markdown ol {
+	margin:0 1.5em 1.5em 1.5em;
+}
diff --git a/client/src/components/Level.tsx b/client/src/components/Level.tsx
index 18b511e..575841c 100644
--- a/client/src/components/Level.tsx
+++ b/client/src/components/Level.tsx
@@ -41,64 +41,7 @@ import Divider from '@mui/material/Divider';
 import Markdown from './Markdown';
 import { SetTitleContext } from '../App';
 
-
-
-/** Drawer Test */
-const drawerWidth = 400; /* TODO: This width is hard-coded. Fix me. */
-
-const openedMixin = (theme: Theme): CSSObject => ({
-  width: drawerWidth,
-  transition: theme.transitions.create('width', {
-    easing: theme.transitions.easing.sharp,
-    duration: theme.transitions.duration.enteringScreen,
-  }),
-  overflowX: 'hidden',
-});
-
-const closedMixin = (theme: Theme): CSSObject => ({
-  transition: theme.transitions.create('width', {
-    easing: theme.transitions.easing.sharp,
-    duration: theme.transitions.duration.leavingScreen,
-  }),
-  overflowX: 'hidden',
-  width: `calc(${theme.spacing(7)} + 1px)`,
-  [theme.breakpoints.up('sm')]: {
-    width: `calc(${theme.spacing(8)} + 1px)`,
-  },
-});
-
-const DrawerHeader = styled('div')(({ theme }) => ({
-  display: 'flex',
-  alignItems: 'center',
-  justifyContent: 'flex-end',
-  padding: theme.spacing(0, 1),
-  // necessary for content to be below app bar
-  ...theme.mixins.toolbar,
-}));
-
-interface AppBarProps extends MuiAppBarProps {
-  open?: boolean;
-}
-
-const Drawer = styled(MuiDrawer, { shouldForwardProp: (prop) => prop !== 'open' })(
-  ({ theme, open }) => ({
-    width: drawerWidth,
-    flexShrink: 0,
-    whiteSpace: 'nowrap',
-    boxSizing: 'border-box',
-    ...(open && {
-      ...openedMixin(theme),
-      '& .MuiDrawer-paper': openedMixin(theme),
-    }),
-    ...(!open && {
-      ...closedMixin(theme),
-      '& .MuiDrawer-paper': closedMixin(theme),
-    }),
-  }),
-);
-
-/** End Drawer Test */
-
+import Split from 'react-split'
 
 export const MonacoEditorContext = React.createContext<monaco.editor.IStandaloneCodeEditor>(null as any);
 
@@ -141,16 +84,6 @@ function Level() {
   const {editor, infoProvider, editorConnection} =
     useLevelEditor(worldId, levelId, codeviewRef, initialCode, onDidChangeContent)
 
-  const {setTitle, setSubtitle} = React.useContext(SetTitleContext);
-
-  useEffect(() => {
-    if (level?.data?.title) {
-      setSubtitle(``)
-    } else {
-      setSubtitle(`Level ${levelId}`)
-    }
-  }, [levelId, level?.data?.title])
-
   return <>
     <div style={level.isLoading ? null : {display: "none"}} className="app-content loading"><CircularProgress /></div>
     <div style={level.isLoading ? {display: "none"} : null} className="app-bar">
@@ -173,38 +106,31 @@ function Level() {
       </div>
 
     </div>
-    <div style={level.isLoading ? {display: "none"} : null} className="app-content level">
-      <Drawer variant="permanent" open={showSidePanel} className="doc-panel">
-        <DrawerHeader>
-        </DrawerHeader>
-        <Divider />
-        <IconButton onClick={toggleSidePanel}>
-          <FontAwesomeIcon icon={showSidePanel ? faChevronLeft : faChevronRight}></FontAwesomeIcon>
-        </IconButton>
-          <LeftPanel spells={level?.data?.tactics} inventory={level?.data?.lemmas} showSidePanel={showSidePanel} setShowSidePanel={setShowSidePanel} />
-      </Drawer>
-      <Grid container columnSpacing={{ xs: 1, sm: 2, md: 3 }} sx={{ flexGrow: 1, p: 3 }} className="main-grid">
-        <Grid xs={8} className="main-panel">
-          <div ref={introductionPanelRef} className="introduction-panel">
-            <Markdown>{level?.data?.introduction}</Markdown>
-          </div>
-          <div className="exercise">
-            <h4>Aufgabe:</h4>
-            <Markdown>{level?.data?.descrText}</Markdown>
-            <div className="statement"><code>{level?.data?.descrFormat}</code></div>
-            <div ref={codeviewRef} className="codeview"></div>
-          </div>
-        </Grid>
-        <Grid xs={4} className="info-panel">
-          <EditorContext.Provider value={editorConnection}>
-            <MonacoEditorContext.Provider value={editor}>
-              {editorConnection && <Main key={`${worldId}/${levelId}`} world={worldId} level={levelId} />}
-            </MonacoEditorContext.Provider>
-          </EditorContext.Provider>
-        </Grid>
-      </Grid>
-    </div>
-    </>
+    <Split minSize={200} className={`app-content level ${level.isLoading ? 'hidden' : ''}}`}>
+      <div className="main-panel">
+        <div ref={introductionPanelRef} className="introduction-panel">
+          <Markdown>{level?.data?.introduction}</Markdown>
+        </div>
+        <div className="exercise">
+          <h4>Aufgabe:</h4>
+          <Markdown>{level?.data?.descrText}</Markdown>
+          <div className="statement"><code>{level?.data?.descrFormat}</code></div>
+          <div ref={codeviewRef} className="codeview"></div>
+        </div>
+      </div>
+      <div className="info-panel">
+        <EditorContext.Provider value={editorConnection}>
+          <MonacoEditorContext.Provider value={editor}>
+            {editorConnection && <Main key={`${worldId}/${levelId}`} world={worldId} level={levelId} />}
+          </MonacoEditorContext.Provider>
+        </EditorContext.Provider>
+      </div>
+      <div className="doc-panel">
+        <LeftPanel spells={level?.data?.tactics} inventory={level?.data?.lemmas}
+          showSidePanel={showSidePanel} setShowSidePanel={setShowSidePanel} />
+      </div>
+    </Split>
+  </>
 }
 
 export default Level
diff --git a/client/src/components/Markdown.tsx b/client/src/components/Markdown.tsx
index b441f00..6ac64b7 100644
--- a/client/src/components/Markdown.tsx
+++ b/client/src/components/Markdown.tsx
@@ -12,7 +12,7 @@ function Markdown(props) {
         rehypePlugins: [...props.remarkPlugins ?? [], rehypeKatex],
       };
       return (
-        <ReactMarkdown {...newProps} />
+        <ReactMarkdown {...newProps} className="markdown" />
       );
 }
 
diff --git a/client/src/components/level.css b/client/src/components/level.css
index 5d70d46..b094a8f 100644
--- a/client/src/components/level.css
+++ b/client/src/components/level.css
@@ -5,6 +5,25 @@
   display: flex;
 }
 
+.hidden {
+  display: none;
+}
+
+.gutter {
+  background-color: #eee;
+
+  background-repeat: no-repeat;
+  background-position: 50%;
+}
+
+.gutter.gutter-vertical {
+  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAFAQMAAABo7865AAAABlBMVEVHcEzMzMzyAv2sAAAAAXRSTlMAQObYZgAAABBJREFUeF5jOAMEEAIEEFwAn3kMwcB6I2AAAAAASUVORK5CYII=');
+}
+
+.gutter.gutter-horizontal {
+  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==');
+}
+
 .main-panel, .info-panel {
   height: 100%;
   overflow: auto;
@@ -16,7 +35,11 @@
 }
 
 .introduction-panel {
-  width: 100%;
+  padding: 1em;
+}
+
+.exercise {
+  padding: 1em;
 }
 
 .exercise {
diff --git a/package-lock.json b/package-lock.json
index 452d844..872ea83 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,6 +29,7 @@
         "react-markdown": "^8.0.4",
         "react-redux": "^8.0.5",
         "react-router-dom": "^6.5.0",
+        "react-split": "^2.0.14",
         "rehype-katex": "^6.0.2",
         "remark-gfm": "^3.0.1",
         "remark-math": "^5.1.1",
diff --git a/package.json b/package.json
index 2e511b9..18ca722 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,6 @@
     "@emotion/styled": "^11.10.5",
     "@fontsource/roboto": "^4.5.8",
     "@fontsource/roboto-mono": "^4.5.8",
-    "lean4-infoview": "https://gitpkg.now.sh/leanprover/vscode-lean4/lean4-infoview?master",
     "@mui/icons-material": "^5.11.0",
     "@mui/material": "^5.11.1",
     "@reduxjs/toolkit": "^1.9.1",
@@ -18,6 +17,7 @@
     "cytoscape-klay": "^3.1.4",
     "debounce": "^1.2.1",
     "express": "^4.18.2",
+    "lean4-infoview": "https://gitpkg.now.sh/leanprover/vscode-lean4/lean4-infoview?master",
     "lean4web": "github:hhu-adam/lean4web",
     "path-browserify": "^1.0.1",
     "react": "^18.2.0",
@@ -25,6 +25,7 @@
     "react-markdown": "^8.0.4",
     "react-redux": "^8.0.5",
     "react-router-dom": "^6.5.0",
+    "react-split": "^2.0.14",
     "rehype-katex": "^6.0.2",
     "remark-gfm": "^3.0.1",
     "remark-math": "^5.1.1",