all

1/src/App.css

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+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

1/src/App.jsx

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+import React from 'react';
+import MyInput from './MyInput';
+import MyOutput from './MyOutput';
+
+export default function App() {
+  return (
+    <div className="App">
+      <MyInput />
+      <MyOutput />
+    </div>
+  );
+}

1/src/FontSize.css

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+.button {
+    background-color: #AAA;
+    font-weight: bold;
+    font-size: 32px;
+    border-radius: 15%;
+    width: 60px;
+    height: 60px;
+  }
+  
+.niceButtons {
+    background-color: transparent;
+    width: 200px;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    font-size: 32px;
+}
+

1/src/FontSize.jsx

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+import React from 'react';
+import './FontSize.css';
+import { useSelector, useDispatch } from 'react-redux';
+
+export default function FontSize() {
+  const size = useSelector(state => state.size);
+  const dispatch = useDispatch();
+
+  return (
+    <div>
+      FontSize
+      <div className='niceButtons'>
+        <span>{size}</span>
+        <button className='button' onClick={() => dispatch({ type: 'font/increase' })}>+</button>
+        <button className='button' onClick={() => dispatch({ type: 'font/decrease' })}>-</button>
+      </div>
+    </div>
+  );
+}

1/src/MyInput.css

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+.article {
+  background-color:rgb(213, 245, 255);
+  height: 150px;
+  border-collapse:collapse;
+  border: 1px #000 solid;
+  width: 100%;
+}
+
+td {
+  border-collapse:collapse;
+  border:1px solid#000;
+  padding: 5px;
+}

1/src/MyInput.jsx

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+import React from 'react';
+import FontSize from './FontSize';
+import TextInput from './TextInput';
+import MyReset from './MyReset';
+import './MyInput.css';
+
+export default function MyInput() {
+  return (
+    <div>
+      <table className="article">
+        <tbody>
+          <tr>
+            <td align="center" width="10%"><FontSize /></td>
+            <td align="left" width="70%"><TextInput /></td>
+            <td align="left" width="10%"><MyReset /></td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+  );
+}

1/src/MyOutput.css

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+.show {
+    background-color:rgb(255, 233, 133);
+    height: 130px;
+    padding: 20px;
+    text-align: center;
+    border-collapse:collapse;
+    border: 1px #000 solid;
+    width: 100%;
+  }
+

1/src/MyOutput.jsx

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+import React from 'react';
+import './MyOutput.css';
+import { useSelector } from 'react-redux';
+
+export default function MyOutput() {
+  const text = useSelector(state => state.text);
+  const size = useSelector(state => state.size);
+
+  return (
+    <div className="show" style={{ fontSize: `${size}px` }}>
+      {text || "Hier soll der Text in der ausgewählten Größe stehen ..."}
+    </div>
+  );
+}

1/src/MyReset.css

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+.button {
+    background-color: rgb(170, 170, 170);
+    font-weight: bold;
+    font-size: 32px;
+    border-radius: 15%;
+    width: 60px;
+    height: 60px;
+  }
+
+

1/src/MyReset.jsx

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+import React from 'react';
+import './MyReset.css';
+import { useDispatch } from 'react-redux';
+
+export default function MyReset() {
+  const dispatch = useDispatch();
+
+  return (
+    <div>
+      <button className="button" onClick={() => dispatch({ type: 'font/reset' })}>R</button>
+    </div>
+  );
+}

1/src/TextInput.css

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+.NiceInput {
+  border-radius: 16px;
+  padding: 10px;
+  margin: auto;
+  background-color:#AEA;
+  font-size: 24px;
+  width:90%;
+}
+
+

1/src/TextInput.jsx

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+import React from 'react';
+import './TextInput.css';
+import { useSelector, useDispatch } from 'react-redux';
+
+export default function TextInput() {
+  const text = useSelector(state => state.text);
+  const dispatch = useDispatch();
+
+  return (
+    <div>
+      <input
+        className="NiceInput"
+        type="text"
+        value={text}
+        onChange={(e) => dispatch({ type: 'text/update', payload: e.target.value })}
+      />
+    </div>
+  );
+}

1/src/assets/react.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

1/src/index.css

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+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

1/src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import { Provider } from 'react-redux';
+import store from './store';
+
+ReactDOM.render(
+  <Provider store={store}>
+    <App />
+  </Provider>,
+  document.getElementById('root')
+);

1/src/main.jsx

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+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import App from './App';
+import './index.css';
+
+import { Provider } from 'react-redux';
+import store from './store';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
+  <Provider store={store}>
+    <App />
+  </Provider>
+);

1/src/reducer.js

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+const initialState = {
+    size: 16,
+    text: "!"
+  };
+  
+  export default function appReducer(state = initialState, action) {
+    switch (action.type) {
+      case 'font/increase':
+        return { ...state, size: state.size + 1 };
+      case 'font/decrease':
+        return { ...state, size: state.size - 1 };
+      case 'font/reset':
+        return initialState;
+      case 'text/update':
+        return { ...state, text: action.payload };
+      default:
+        return state;
+    }
+  }
+  

1/src/store.js

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+import { configureStore } from '@reduxjs/toolkit';
+import reducer from './reducer';
+
+const store = configureStore({
+  reducer: reducer
+});
+
+export default store;