diff --git a/client/src/components/PrivacyPolicy.tsx b/client/src/components/PrivacyPolicy.tsx
new file mode 100644
index 0000000..774cc36
--- /dev/null
+++ b/client/src/components/PrivacyPolicy.tsx
@@ -0,0 +1,52 @@
+import { faShield } from '@fortawesome/free-solid-svg-icons';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import * as React from 'react'
+
+const PrivacyPolicy: React.FC = () => {
+  const [open, setOpen] = React.useState(false);
+  const handleOpen = () => setOpen(true);
+  const handleClose = () => setOpen(false);
+
+  return (
+    <span>
+          <div className="privacy" onClick={handleOpen} title="Privacy Policy &amp; Impressum">
+            <FontAwesomeIcon icon={faShield} />
+            <p className="p1">legal</p>
+            <p className="p2">notes</p>
+          </div>
+      {open?
+        <div className="modal-wrapper">
+          <div className="modal-backdrop" onClick={handleClose} />
+          <div className="modal">
+            <div className="codicon codicon-close modal-close" onClick={handleClose}></div>
+            <h2>Privacy Policy &amp; Impressum</h2>
+
+            <p>Our server collects metadata (such as IP address, browser, operating system)
+            and the data that the user enters into the editor. The data is used to
+            compute the Lean output and display it to the user. The information will be stored
+            as long as the user stays on our website and will be deleted immediately afterwards.
+            We keep logs to improve our software, but the contained data is anonymized.</p>
+
+            <p>We do not use cookies, but your game progress is stored in the browser
+              as site data. Your game progress is not saved on the server; if you delete
+              your browser storage, it is completely gone.
+            </p>
+
+            <p>Our server is located in Germany.</p>
+
+            <p><strong>Contact information:</strong><br />
+              Jon Eugster<br />
+              Mathematisches Institut der Heinrich-Heine-Universität Düsseldorf<br />
+              Universitätsstr. 1<br />
+              40225 Düsseldorf<br />
+              Germany<br />
+              <a href="mailto:jon.eugster@hhu.de">jon.eugster@hhu.de</a>
+
+            </p>
+          </div>
+        </div> : null}
+    </span>
+  )
+}
+
+export default PrivacyPolicy
diff --git a/client/src/components/Welcome.tsx b/client/src/components/Welcome.tsx
index 2ee5de7..a69d37f 100644
--- a/client/src/components/Welcome.tsx
+++ b/client/src/components/Welcome.tsx
@@ -5,7 +5,9 @@ import cytoscape, { LayoutOptions } from 'cytoscape'
 import klay from 'cytoscape-klay';
 import { useNavigate } from 'react-router-dom';
 import { useSelector } from 'react-redux';
+import Split from 'react-split'
 
+import PrivacyPolicy from './PrivacyPolicy';
 
 cytoscape.use( klay );
 
@@ -16,14 +18,23 @@ import Markdown from './Markdown';
 import { selectCompleted } from '../state/progress';
 import { GameIdContext } from '../App';
 
+const N = 24          // max number of levels per world
+const R = 800         // radius of a world
+const r = 110          // radius of a level
+const s = 100         // global scale
+const padding = 2000  // padding of the graphic (on a different scale)
 
 function LevelIcon({ worldId, levelId, position }) {
   const gameId = React.useContext(GameIdContext)
   const completed = useSelector(selectCompleted(gameId, worldId,levelId))
+
+  const x = s * position.x + Math.sin(levelId * 2 * Math.PI / N) * (R + 1.2*r + 2*Math.floor((levelId - 1)/N))
+  const y = s * position.y - Math.cos(levelId * 2 * Math.PI / N) * (R + 1.2*r + 2*Math.floor((levelId - 1)/N))
+
   // TODO: relative positioning?
   return (
     <Link to={`/game/${gameId}/world/${worldId}/level/${levelId}`} key={`/game/${gameId}/world/${worldId}/level/${levelId}`}>
-      <circle fill={completed ? "green" :"#aaa"} cx={position.x + Math.sin(levelId/5) * 9} cy={position.y - Math.cos(levelId/5) * 9} r="0.8" />
+      <circle fill={completed ? "green" :"#999"} cx={x} cy={y} r={r} />
     </Link>
   )
 }
@@ -42,56 +53,66 @@ function Welcome() {
     }
   }, [gameInfo.data?.title])
 
-  const padding = 20
-
   const svgElements = []
 
   if (gameInfo.data) {
     for (let i in gameInfo.data.worlds.edges) {
       const edge = gameInfo.data.worlds.edges[i]
       svgElements.push(
-        <line key={`pathway${i}`} x1={nodes[edge[0]].position.x} y1={nodes[edge[0]].position.y}
-          x2={nodes[edge[1]].position.x} y2={nodes[edge[1]].position.y} stroke="#1976d2" strokeWidth="1"/>
+        <line key={`pathway${i}`} x1={s*nodes[edge[0]].position.x} y1={s*nodes[edge[0]].position.y}
+          x2={s*nodes[edge[1]].position.x} y2={s*nodes[edge[1]].position.y} stroke="#1976d2" strokeWidth={s}/>
       )
     }
+
     for (let id in nodes) {
       let position: cytoscape.Position = nodes[id].position
 
-      svgElements.push(
-        <Link key={`world${id}`} to={`/game/${gameId}/world/${id}/level/0`}>
-          <circle className="world-circle" cx={position.x} cy={position.y} r="8" />
-          <text className="world-name"
-            x={position.x} y={position.y}>{nodes[id].data.title ? nodes[id].data.title : id}</text>
-        </Link>
-      )
-
       for (let i = 1; i <= gameInfo.data.worldSize[id]; i++) {
         svgElements.push(
           <LevelIcon position={position} worldId={id} levelId={i} />
         )
       }
+
+      svgElements.push(
+        <Link key={`world${id}`} to={`/game/${gameId}/world/${id}/level/0`}>
+          <circle className="world-circle" cx={s*position.x} cy={s*position.y} r={R}
+              fill="#1976d2"/>
+          <foreignObject className="world-title-wrapper" x={s*position.x} y={s*position.y}
+              width={1.42*R} height={1.42*R} transform={"translate("+ -.71*R +","+ -.71*R +")"}>
+            <div>
+              <p className="world-title" style={{fontSize: Math.floor(R/4) + "px"}}>
+                {nodes[id].data.title ? nodes[id].data.title : id}
+              </p>
+            </div>
+          </foreignObject>
+        </Link>
+      )
     }
   }
 
-  return <div>
+  return <div className="app-content ">
   { gameInfo.isLoading?
-    <Box display="flex" alignItems="center" justifyContent="center" sx={{ height: "calc(100vh - 64px)" }}><CircularProgress /></Box>
+    <Box display="flex" alignItems="center" justifyContent="center" sx={{ height: "calc(100vh - 64px)" }}>
+      <CircularProgress />
+    </Box>
     :
-    <div className="app-content">
-      <Box sx={{ m: 3 }}>
-        <Typography variant="body1" component="div">
+    <Split className="welcome" minSize={200} sizes={[70, 30]}>
+      <div className="column">
+        <Typography variant="body1" component="div" className="welcome-text">
           <Markdown>{gameInfo.data?.introduction}</Markdown>
         </Typography>
-      </Box>
-      <Box textAlign='center' sx={{ m: 5 }}>
-        <svg xmlns="http://www.w3.org/2000/svg" xmlnsXlink="http://www.w3.org/1999/xlink" width="30%"
-            viewBox={bounds ? `${bounds.x1 - padding} ${bounds.y1 - padding} ${bounds.x2 - bounds.x1 + 2 * padding} ${bounds.y2 - bounds.y1 + 2 * padding}` : ''}>
-          {svgElements}
-        </svg>
-      </Box>
-    </div>
+      </div>
+      <div className="column">
+        <Box textAlign='center' sx={{ m: 5 }}>
+          <svg xmlns="http://www.w3.org/2000/svg" xmlnsXlink="http://www.w3.org/1999/xlink"
+              viewBox={bounds ? `${s*bounds.x1 - padding} ${s*bounds.y1 - padding} ${s*bounds.x2 - s*bounds.x1 + 2 * padding} ${s*bounds.y2 - s*bounds.y1 + 2 * padding}` : ''}>
+            {svgElements}
+          </svg>
+        </Box>
+      </div>
+    </Split>
   }
-
+    <PrivacyPolicy/>
   </div>
 }
 
@@ -119,9 +140,8 @@ function computeWorldLayout(worlds) {
     headless: true,
     styleEnabled: false
   })
-// TODO: Jon play around with graph layout
 
-  const layout = cy.layout({name: "klay", klay: {direction: "DOWN"}} as LayoutOptions).run()
+  const layout = cy.layout({name: "klay", klay: {direction: "DOWN", nodePlacement: "LINEAR_SEGMENTS"}} as LayoutOptions).run()
   let nodes = {}
   cy.nodes().forEach((node, id) => {
     nodes[node.id()] = {
diff --git a/client/src/components/welcome.css b/client/src/components/welcome.css
index 849f441..8e457a2 100644
--- a/client/src/components/welcome.css
+++ b/client/src/components/welcome.css
@@ -1,12 +1,191 @@
 
-svg .world-circle {
+/* svg .world-circle {
   fill: var(--clr-primary)
+} */
+
+.welcome {
+  height: 100%;
+  flex: 1;
+  min-height: 0;
+  display: flex;
+}
+
+.app-content {
+  height: 100%
+}
+
+.welcome .column {
+  height: 100%;
+  overflow: auto;
+}
+
+.welcome-text {
+  padding: 20px;
+}
+
+h1 {
+  font-size: 2em;
+  margin: .67em 0;
+}
+
+h2 {
+  font-size: 1.5em;
+}
+
+h3 {
+  font-size: 1.3em;
+}
+
+h4 {
+  font-size: 1.1em;
+  font-style: italic;
+}
+
+h5, h6 {
+  font-size: 1em;
+  font-style: italic;
+}
+
+/***************/
+/* SVG Graphic */
+/***************/
+
+svg .world-title-wrapper {
+  overflow: auto;
+}
+
+svg .world-title-wrapper div {
+  width: 100%;
+  height: 100%;
+}
+
+svg .world-title-wrapper div {
+  display: flex;
+  align-items:center;
+  justify-content:center;
+  overflow: visible;
+
 }
 
-svg .world-name {
-  fill: white;
-  font-size: 2px;
+svg .world-title {
   font-weight: 500;
-  text-anchor: middle;
-  dominant-baseline: middle;
+  color: white;
+  margin: 0;
+  padding: 0;
+}
+
+/******************/
+/* Privacy Button */
+/******************/
+
+.privacy {
+  width: 40px;
+  height: 40px;
+  font-size: 25px;
+  border-radius: 20px;
+  position: absolute;
+  right: 10px;
+  bottom: 10px;
+  display: flex;
+  align-items:center;
+  justify-content:center;
+  color: #aaa;
+  background-color: #eee;
+  cursor: pointer;
+}
+
+.privacy p {
+  position: absolute;
+  color: #888;
+  bottom: 1.5px;
+  font-size: 6px;
+}
+
+.privacy .p1 {
+  transform: rotate(50deg);
+  left: 1.5px;
+}
+
+.privacy .p2 {
+  transform: rotate(-50deg);
+  right: 1.5px;
+}
+
+/*****************/
+/* Privacy Popup */
+/*****************/
+
+.modal-wrapper {
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  padding: 0;
+}
+
+.modal-backdrop {
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  background: rgba(0, 0, 0, 0.25);
+  z-index: 2;
+}
+
+.modal h2 {
+  text-align: center;
+}
+
+.modal {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  min-width: 50%;
+  max-width: 60ch;
+  background: #fff;
+  z-index: 3;
+  padding: 2em;
+  border-radius: 1em;
+  text-align: left;
+  color: var(--vscode-breadcrumb-foreground);
+}
+
+.modal input[type="text"] {
+  width: 100%;
+}
+
+.modal .form-error {
+  color: #a00;
+  font-weight: bold;
+}
+
+.modal input[type="submit"] {
+  border: none;
+  color: var(--vscode-button-foreground);
+  background: var(--vscode-button-background);
+  cursor: pointer;
+  padding: .5em 1em;
+  border-radius: .2em;
+  display: block;
+  margin: 1em auto;
+}
+
+.modal-close {
+  float: right;
+  scale: 2;
+  color: var(--vscode-breadcrumb-foreground);
+  cursor: pointer;
+}
+
+.modal-close:hover {
+  float: right;
+  scale: 2;
+  color: var(--vscode-breadcrumb-focusForeground);
+}
+
+.modal table {
+  width: 100%;
 }
diff --git a/package-lock.json b/package-lock.json
index 26c2ec9..2e6d55a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,7 @@
         "@types/cytoscape": "^3.19.9",
         "@types/react-router-dom": "^5.3.3",
         "cytoscape": "^3.23.0",
+        "cytoscape-elk": "^2.1.0",
         "cytoscape-klay": "^3.1.4",
         "debounce": "^1.2.1",
         "express": "^4.18.2",
@@ -34,6 +35,7 @@
         "remark-gfm": "^3.0.1",
         "remark-math": "^5.1.1",
         "vscode-ws-jsonrpc": "^2.0.1",
+        "web-worker": "^1.2.0",
         "ws": "^8.11.0"
       },
       "devDependencies": {
@@ -4180,6 +4182,17 @@
         "node": ">=0.10"
       }
     },
+    "node_modules/cytoscape-elk": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cytoscape-elk/-/cytoscape-elk-2.1.0.tgz",
+      "integrity": "sha512-stkKoUTNOqpyP5eMuqatK0EYir2NWGTH+XlY0rxFj0t0HiQPGI4AuSuTPaGbNM1WhVfb0tWJ5TQQ0R0qshACLw==",
+      "dependencies": {
+        "elkjs": "^0.8.1"
+      },
+      "peerDependencies": {
+        "cytoscape": "^3.2.0"
+      }
+    },
     "node_modules/cytoscape-klay": {
       "version": "3.1.4",
       "resolved": "https://registry.npmjs.org/cytoscape-klay/-/cytoscape-klay-3.1.4.tgz",
@@ -4435,6 +4448,11 @@
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.286.tgz",
       "integrity": "sha512-Vp3CVhmYpgf4iXNKAucoQUDcCrBQX3XLBtwgFqP9BUXuucgvAV9zWp1kYU7LL9j4++s9O+12cb3wMtN4SJy6UQ=="
     },
+    "node_modules/elkjs": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/elkjs/-/elkjs-0.8.2.tgz",
+      "integrity": "sha512-L6uRgvZTH+4OF5NE/MBbzQx/WYpru1xCBE9respNj6qznEewGUIfhzmm7horWWxbNO2M0WckQypGctR8lH79xQ=="
+    },
     "node_modules/emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
@@ -9869,6 +9887,11 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/web-worker": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/web-worker/-/web-worker-1.2.0.tgz",
+      "integrity": "sha512-PgF341avzqyx60neE9DD+XS26MMNMoUQRz9NOZwW32nPQrF6p77f1htcnjBSEV8BGMKZ16choqUG4hyI0Hx7mA=="
+    },
     "node_modules/webpack": {
       "version": "5.75.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.75.0.tgz",
diff --git a/package.json b/package.json
index fc3bf0a..67cab6b 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "@types/cytoscape": "^3.19.9",
     "@types/react-router-dom": "^5.3.3",
     "cytoscape": "^3.23.0",
+    "cytoscape-elk": "^2.1.0",
     "cytoscape-klay": "^3.1.4",
     "debounce": "^1.2.1",
     "express": "^4.18.2",
@@ -30,6 +31,7 @@
     "remark-gfm": "^3.0.1",
     "remark-math": "^5.1.1",
     "vscode-ws-jsonrpc": "^2.0.1",
+    "web-worker": "^1.2.0",
     "ws": "^8.11.0"
   },
   "devDependencies": {