diff --git a/tank-frontend/src/JoinForm.tsx b/tank-frontend/src/JoinForm.tsx
index fd509d2..0b5791d 100644
--- a/tank-frontend/src/JoinForm.tsx
+++ b/tank-frontend/src/JoinForm.tsx
@@ -34,7 +34,7 @@ export default function JoinForm({onDone}: {
         <TextInput
             value={name}
             placeholder="player name"
-            onChange={e => setName(e.target.value)}
+            onChange={n => setName(n)}
             onEnter={confirm}
         />
         <Button
diff --git a/tank-frontend/src/MapChooser.tsx b/tank-frontend/src/MapChooser.tsx
index 607f54e..3725d2f 100644
--- a/tank-frontend/src/MapChooser.tsx
+++ b/tank-frontend/src/MapChooser.tsx
@@ -7,6 +7,7 @@ import Column from './components/Column.tsx';
 import Button from './components/Button.tsx';
 import Row from './components/Row.tsx';
 import './MapChooser.css';
+import Spacer from './components/Spacer.tsx';
 
 function base64ToArrayBuffer(base64: string) {
     const binaryString = atob(base64);
@@ -57,7 +58,7 @@ function MapChooserDialog({mapNames, onClose, onConfirm}: {
     readonly onClose: () => void;
 }) {
     const [chosenMap, setChosenMap] = useState<string>();
-    return <Dialog title='Choose a map' onClose={onClose}>
+    return <Dialog title="Choose a map" onClose={onClose}>
         <Row className="MapChooser-Row overflow-scroll">
             {mapNames.map(name => <MapPreview
                 key={name}
@@ -67,7 +68,7 @@ function MapChooserDialog({mapNames, onClose, onConfirm}: {
             />)}
         </Row>
         <Row>
-            <div className="flex-grow"/>
+            <Spacer/>
             <Button text="« cancel" onClick={onClose}/>
             <Button text="√ confirm" disabled={!chosenMap} onClick={() => chosenMap && onConfirm(chosenMap)}/>
         </Row>
diff --git a/tank-frontend/src/ThemeChooser.tsx b/tank-frontend/src/ThemeChooser.tsx
index 9bae98d..9b10c31 100644
--- a/tank-frontend/src/ThemeChooser.tsx
+++ b/tank-frontend/src/ThemeChooser.tsx
@@ -1,27 +1,28 @@
 import Button from './components/Button.tsx';
 import {getRandomTheme, HSL, hslToString, useHslTheme} from './theme.tsx';
 import Dialog from './components/Dialog.tsx';
-import {useState} from 'react';
-import {NumberInput, RangeInput} from './components/Input.tsx';
+import {useMemo, useState} from 'react';
+import {NumberInput, RangeInput, TextInput} from './components/Input.tsx';
 import Row from './components/Row.tsx';
 import Column from './components/Column.tsx';
 import './ThemeChooser.css';
+import Spacer from './components/Spacer.tsx';
 
 function HslEditor({name, value, setValue}: {
     name: string;
     value: HSL;
     setValue: (value: HSL) => void
 }) {
-    const setH = (h: number) =>  setValue({...value, h});
-    const setS = (s: number) =>  setValue({...value, s});
-    const setL = (l: number) =>  setValue({...value, l});
+    const setH = (h: number) => setValue({...value, h});
+    const setS = (s: number) => setValue({...value, s});
+    const setL = (l: number) => setValue({...value, l});
 
     return <Column>
         <Row>
             <div className="" style={{background: hslToString(value), border: '1px solid white', aspectRatio: '1'}}/>
             <p>{name}</p>
         </Row>
-        <div className='HslEditor-Inputs'>
+        <div className="HslEditor-Inputs">
             <p>Hue</p>
             <NumberInput value={Math.round(value.h)} onChange={setH}/>
             <RangeInput value={Math.round(value.h)} min={0} max={360} onChange={setH}/>
@@ -41,14 +42,43 @@ function ThemeChooserDialog({onClose}: {
     onClose: () => void;
 }) {
     const {hslTheme, setHslTheme} = useHslTheme();
+    const [themeString, setThemeString] = useState<string>(JSON.stringify(hslTheme));
+    const [errorMsg, setErrorMsg] = useState<string>();
+
+    useMemo(() => {
+        setThemeString(JSON.stringify(hslTheme));
+    }, [hslTheme]);
+
     return <Dialog title="Theme editor" onClose={onClose}>
         <Row>
             <Button
-                text="surprise me"
-                className='flex-grow'
+                text="? randomize"
                 onClick={() => setHslTheme(_ => getRandomTheme())}/>
+            <Spacer/>
         </Row>
-        <Column className='overflow-scroll'>
+        <Row>
+            <TextInput
+                value={themeString}
+                onChange={setThemeString}
+                className="flex-grow"/>
+            <Button text="» import" onClick={() => {
+                try {
+                    const theme = JSON.parse(themeString);
+                    setHslTheme(old => ({...old, theme}));
+                } catch (e: any) {
+                    setErrorMsg(e.message);
+                }
+            }}/>
+            {errorMsg &&
+                <Dialog
+                    title="Error"
+                    onClose={() => setErrorMsg(undefined)}
+                >
+                    <p>{errorMsg}</p>
+                </Dialog>
+            }
+        </Row>
+        <Column className="overflow-scroll">
             <HslEditor
                 name="background"
                 value={hslTheme.background}
diff --git a/tank-frontend/src/components/Input.tsx b/tank-frontend/src/components/Input.tsx
index f35525f..37f7ab7 100644
--- a/tank-frontend/src/components/Input.tsx
+++ b/tank-frontend/src/components/Input.tsx
@@ -1,8 +1,7 @@
-import {ChangeEventHandler} from 'react';
 import './Input.css';
 
 export function TextInput({onChange, className, value, placeholder, onEnter}: {
-    onChange?: ChangeEventHandler<HTMLInputElement> | undefined;
+    onChange?: (value: string) => void;
     className?: string;
     value: string;
     placeholder?: string;
@@ -13,10 +12,15 @@ export function TextInput({onChange, className, value, placeholder, onEnter}: {
         className={'Input ' + (className ?? '')}
         value={value}
         placeholder={placeholder}
-        onChange={onChange}
+        onChange={event => {
+            if (!onChange)
+                return;
+            onChange(event.target.value);
+        }}
         onKeyUp={event => {
-            if (onEnter && event.key === 'Enter')
-                onEnter();
+            if (!onEnter || event.key !== 'Enter')
+                return;
+            onEnter();
         }}
     />;
 }
diff --git a/tank-frontend/src/components/Spacer.tsx b/tank-frontend/src/components/Spacer.tsx
new file mode 100644
index 0000000..a2f41d1
--- /dev/null
+++ b/tank-frontend/src/components/Spacer.tsx
@@ -0,0 +1,4 @@
+
+export default function Spacer() {
+    return <div className='flex-grow' />;
+}