diff --git a/tank-frontend/src/App.tsx b/tank-frontend/src/App.tsx
index 1759ffd..eb0fbf7 100644
--- a/tank-frontend/src/App.tsx
+++ b/tank-frontend/src/App.tsx
@@ -10,6 +10,7 @@ import Row from "./components/Row.tsx";
 import Scoreboard from "./Scoreboard.tsx";
 import Button from "./components/Button.tsx";
 import './App.css';
+import {getRandomTheme, useStoredTheme} from "./theme.ts";
 
 const getNewNameId = () => ({
     id: crypto.randomUUID(),
@@ -17,6 +18,7 @@ const getNewNameId = () => ({
 });
 
 export default function App() {
+    const [theme, setTheme] = useStoredTheme();
     const [nameId, setNameId] = useStoredObjectState<NameId>('access', getNewNameId);
 
     const [isLoggedIn, setLoggedIn] = useState<boolean>(false);
@@ -32,13 +34,14 @@ export default function App() {
     return <Column className='flex-grow'>
         <Row>
             <h1 className='flex-grow'>CCCB-Tanks!</h1>
+            <Button text='change colors' onClick={() => setTheme(getRandomTheme())} />
             <Button
                 onClick={() => window.open('https://github.com/kaesaecracker/cccb-tanks-cs', '_blank')?.focus()}
                 text='GitHub'/>
             {nameId.name !== '' &&
                 <Button onClick={() => setNameId(getNewNameId)} text='logout'/>}
         </Row>
-        <ClientScreen logout={logout}/>
+        <ClientScreen logout={logout} theme={theme}/>
         {nameId.name === '' && <JoinForm setNameId={setNameId} clientId={nameId.id}/>}
         {isLoggedIn && <Row className='GadgetRows'>
             <Controls playerId={nameId.id} logout={logout}/>
diff --git a/tank-frontend/src/ClientScreen.tsx b/tank-frontend/src/ClientScreen.tsx
index c4d826d..0169590 100644
--- a/tank-frontend/src/ClientScreen.tsx
+++ b/tank-frontend/src/ClientScreen.tsx
@@ -1,7 +1,7 @@
 import useWebSocket from 'react-use-websocket';
 import {useEffect, useRef} from 'react';
 import './ClientScreen.css';
-import {getTheme} from "./theme.ts";
+import {hslToString, Theme} from "./theme.ts";
 
 const pixelsPerRow = 352;
 const pixelsPerCol = 160;
@@ -19,14 +19,13 @@ function normalizeColor(context: CanvasRenderingContext2D, color: string) {
     return context.getImageData(0, 0, 1, 1).data;
 }
 
-function drawPixelsToCanvas(pixels: Uint8Array, canvas: HTMLCanvasElement) {
+function drawPixelsToCanvas(pixels: Uint8Array, canvas: HTMLCanvasElement, theme: Theme) {
     const drawContext = canvas.getContext('2d');
     if (!drawContext)
         throw new Error('could not get draw context');
 
-    const theme = getTheme();
-    const colorPrimary = normalizeColor(drawContext, theme.primary);
-    const colorBackground = normalizeColor(drawContext, theme.background);
+    const colorPrimary = normalizeColor(drawContext, hslToString(theme.primary));
+    const colorBackground = normalizeColor(drawContext, hslToString(theme.background));
 
     const imageData = drawContext.getImageData(0, 0, canvas.width, canvas.height, {colorSpace: 'srgb'});
     const data = imageData.data;
@@ -48,7 +47,7 @@ function drawPixelsToCanvas(pixels: Uint8Array, canvas: HTMLCanvasElement) {
     drawContext.putImageData(imageData, 0, 0);
 }
 
-export default function ClientScreen({logout}: { logout: () => void }) {
+export default function ClientScreen({logout, theme}: { logout: () => void, theme: Theme }) {
     const canvasRef = useRef<HTMLCanvasElement>(null);
 
     const {
@@ -69,9 +68,9 @@ export default function ClientScreen({logout}: { logout: () => void }) {
         if (canvasRef.current === null)
             throw new Error('canvas null');
 
-        drawPixelsToCanvas(new Uint8Array(lastMessage.data), canvasRef.current);
+        drawPixelsToCanvas(new Uint8Array(lastMessage.data), canvasRef.current, theme);
         sendMessage('');
-    }, [lastMessage, canvasRef.current]);
+    }, [lastMessage, canvasRef.current, theme]);
 
     return <canvas ref={canvasRef} id="screen" width={pixelsPerRow} height={pixelsPerCol}/>;
 }
diff --git a/tank-frontend/src/Scoreboard.tsx b/tank-frontend/src/Scoreboard.tsx
index 59e6696..f69a4a5 100644
--- a/tank-frontend/src/Scoreboard.tsx
+++ b/tank-frontend/src/Scoreboard.tsx
@@ -22,8 +22,8 @@ export default function Scoreboard({}: {}) {
         className='flex-grow'
         columns={[
             {field: 'name'},
-            {field: 'kills', visualize: p => p.scores.kills},
-            {field: 'deaths', visualize: p => p.scores.deaths},
-            {field: 'k/d', visualize: p => p.scores.kills / p.scores.deaths}
+            {field: 'kills', visualize: p => p.scores.kills.toString()},
+            {field: 'deaths', visualize: p => p.scores.deaths.toString()},
+            {field: 'k/d', visualize: p => (p.scores.kills / p.scores.deaths).toString()}
         ]}/>
 }
diff --git a/tank-frontend/src/index.tsx b/tank-frontend/src/index.tsx
index db97b83..dc6cffa 100644
--- a/tank-frontend/src/index.tsx
+++ b/tank-frontend/src/index.tsx
@@ -2,10 +2,6 @@ import React from 'react';
 import {createRoot} from 'react-dom/client';
 import './index.css';
 import App from "./App.tsx";
-import {setRandomTheme} from "./theme.ts";
-
-
-setRandomTheme();
 
 createRoot(document.getElementById('root')!).render(
     <React.StrictMode>
diff --git a/tank-frontend/src/theme.ts b/tank-frontend/src/theme.ts
index a9a418c..73bacfe 100644
--- a/tank-frontend/src/theme.ts
+++ b/tank-frontend/src/theme.ts
@@ -1,44 +1,80 @@
-function getRandomColor() {
-    const letters = '0123456789ABCDEF';
-    let color = '#';
-    for (let i = 0; i < 3; i++) {
-        color += letters[Math.floor(Math.random() * letters.length)];
-    }
-    return color;
-}
-
+import {useStoredObjectState} from "./useStoredState.ts";
 
 export type Theme = {
-    primary?: string;
-    secondary?: string;
-    background?: string;
+    primary: HSL;
+    secondary: HSL;
+    background: HSL;
 }
 
 // @ts-ignore
 const rootStyle = document.querySelector(':root')?.style;
 
-export function setTheme(theme: Theme) {
-    if (!rootStyle)
-        return;
-    rootStyle.setProperty('--color-primary', theme.primary);
-    rootStyle.setProperty('--color-secondary', theme.secondary);
-    rootStyle.setProperty('--color-background', theme.background);
+function getRandom(min: number, max: number) {
+    return min + Math.random() * (max - min);
 }
 
-export function getTheme(): Theme {
-    if (!rootStyle)
-        return {};
-    return {
-        primary: rootStyle.getPropertyValue('--color-primary'),
-        secondary: rootStyle.getPropertyValue('--color-secondary'),
-        background: rootStyle.getPropertyValue('--color-background')
+type HSL = {
+    h: number;
+    s: number;
+    l: number;
+}
+
+function getRandomHsl(params: {
+    minHue?: number,
+    maxHue?: number,
+    minSaturation?: number,
+    maxSaturation?: number,
+    minLightness?: number,
+    maxLightness?: number,
+}): HSL {
+    const values = {
+        minHue: 0,
+        maxHue: 360,
+        minSaturation: 0,
+        maxSaturation: 100,
+        minLightness: 0,
+        maxLightness: 100,
+        ...params
     };
+    const h = getRandom(values.minHue, values.maxHue);
+    const s = getRandom(values.minSaturation, values.maxSaturation);
+    const l = getRandom(values.minLightness, values.maxLightness);
+    return {h, s, l};
 }
 
-export function setRandomTheme() {
-    setTheme({
-        primary: getRandomColor(),
-        secondary: getRandomColor(),
-        background: getRandomColor()
-    })
+export function hslToString({h, s, l}: HSL) {
+    return `hsl(${h},${s}%,${l}%)`;
+}
+
+function angle(a: number) {
+    return ((a % 360.0) + 360) % 360;
+}
+
+const goldenAngle = 180 * (3 - Math.sqrt(5));
+
+
+export function getRandomTheme(): Theme {
+    const background = getRandomHsl({maxSaturation: 50, minLightness: 10, maxLightness: 40});
+
+    const primary = getRandomHsl({minSaturation: background.s * 1.2, minLightness: background.l + 20});
+    primary.h = angle(-Math.floor(1 + Math.random() * 2) * goldenAngle + primary.h);
+
+    const secondary = getRandomHsl({minSaturation: background.s * 1.2, minLightness: background.l + 20});
+    primary.h = angle(+Math.floor(1 + Math.random() * 2) * goldenAngle + primary.h);
+
+    return {background, primary, secondary};
+}
+
+export function useStoredTheme(): [Theme, (theme: Theme) => void] {
+    const [theme, setSavedTheme] = useStoredObjectState<Theme>('theme', getRandomTheme);
+
+    function setTheme(theme: Theme) {
+        console.log('set theme', theme);
+        rootStyle.setProperty('--color-primary', hslToString(theme.primary));
+        rootStyle.setProperty('--color-secondary', hslToString(theme.secondary));
+        rootStyle.setProperty('--color-background', hslToString(theme.background));
+        setSavedTheme(_ => theme);
+    }
+
+    return [theme, setTheme];
 }