diff --git a/package-lock.json b/package-lock.json
index ed16ede..331bddd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "geoproject",
       "version": "0.0.0",
       "dependencies": {
+        "highlight.js": "^11.11.1",
         "pagedjs": "^0.4.3",
         "vue": "^3.5.24"
       },
@@ -1182,6 +1183,15 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/highlight.js": {
+      "version": "11.11.1",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-11.11.1.tgz",
+      "integrity": "sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/magic-string": {
       "version": "0.30.21",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
diff --git a/package.json b/package.json
index 6a0a97e..2e1896a 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "highlight.js": "^11.11.1",
     "pagedjs": "^0.4.3",
     "vue": "^3.5.24"
   },
diff --git a/src/App.vue b/src/App.vue
index 5401f04..2372aa6 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,116 +1,193 @@
 <script setup>
 import PagedJsWrapper from './components/PagedJsWrapper.vue';
-import { onMounted, ref, nextTick } from 'vue';
-import { Previewer } from 'pagedjs';
+import EditorPanel from './components/EditorPanel.vue';
+import StylesheetViewer from './components/StylesheetViewer.vue';
+import ElementPopup from './components/ElementPopup.vue';
+import { onMounted, ref, watch } from 'vue';
 
-const marginTop = ref(20);
-let sourceHTML = '';
-let editorUIElement = null;
+// Main state
+const previewFrame = ref(null);
+const stylesheetContent = ref('');
+const aboutFontSize = ref(2);
+const aboutFontSizeUnit = ref('rem');
 
-const renderPaged = async () => {
-  console.log('renderPaged called, marginTop:', marginTop.value);
+// Popup state
+const popupVisible = ref(false);
+const popupPosition = ref({ x: 0, y: 0 });
+const popupSelector = ref('');
+const popupElementCss = ref('');
+const popupFontSize = ref(null);
+const popupFontSizeUnit = ref('rem');
 
-  // Update @page margin dynamically
-  let styleEl = document.getElementById('dynamic-page-style');
-  if (!styleEl) {
-    styleEl = document.createElement('style');
-    styleEl.id = 'dynamic-page-style';
-    document.head.appendChild(styleEl);
-  }
-  styleEl.textContent = `
-    @page {
-      size: A4;
-      margin: ${marginTop.value}mm 15mm 26mm 15mm;
-    }
-  `;
+// PagedJS print rules
+const printStyles = `
+h2 { break-before: page; }
 
-  // Detach UI before PagedJS processes body
-  if (editorUIElement && editorUIElement.parentNode) {
-    editorUIElement.remove();
-  }
-
-  // Remove previous render
-  const existingPages = document.querySelector('.pagedjs_pages');
-  if (existingPages) existingPages.remove();
-
-  // Restore source content to body
-  const printSource = document.getElementById('print-source');
-  if (printSource && sourceHTML) {
-    printSource.innerHTML = sourceHTML;
-    printSource.style.display = 'block';
-  }
-
-  // Render
-  const paged = new Previewer();
-  try {
-    const flow = await paged.preview();
-    console.log('Rendered', flow.total, 'pages.');
-  } catch (e) {
-    console.error('PagedJS error:', e);
-  }
-
-  // Re-inject UI after PagedJS transforms the DOM
-  if (editorUIElement) {
-    document.body.appendChild(editorUIElement);
-    // Apply styles inline since PagedJS removes stylesheets
-    editorUIElement.style.cssText = `
-      position: fixed !important;
-      bottom: 1rem !important;
-      left: 1rem !important;
-      z-index: 9999 !important;
-      background: white;
-      padding: 0.5rem;
-      border-radius: 4px;
-      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
-    `;
-  }
-};
-
-const increaseMargin = () => {
-  marginTop.value += 5;
-  console.log('Button clicked, new margin:', marginTop.value);
-  renderPaged();
-};
-
-onMounted(async () => {
-  await nextTick();
-  // Store source HTML before first render
-  const source = document.getElementById('print-source');
-  if (source) {
-    sourceHTML = source.innerHTML;
-    console.log('Source HTML stored:', sourceHTML.substring(0, 100));
-  }
-  // Store UI element reference
-  editorUIElement = document.getElementById('editor-ui');
-  renderPaged();
-});
-</script>
-
-<template>
-  <!-- Source content -->
-  <div id="print-source">
-    <PagedJsWrapper />
-  </div>
-
-  <!-- Editor UI overlay -->
-  <div id="editor-ui">
-    <button id="increase-margin" @click="increaseMargin">+</button>
-  </div>
-</template>
-
-<style>
-/* PagedJS print styles */
-h2 {
-  break-before: page;
+@page {
+  size: A4;
+  margin: 20mm 15mm 26mm 15mm;
 }
 
 @page {
-  @bottom-center {
-    content: string(title);
-  }
+  @bottom-center { content: string(title); }
 }
 
-.chapter > h2 {
-  string-set: title content(text);
+.chapter > h2 { string-set: title content(text); }
+`;
+
+// CSS parsing utilities
+const extractCssBlock = (css, selector) => {
+  const escaped = selector.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+  const match = css.match(new RegExp(`${escaped}\\s*{[^}]*}`, 'gi'));
+  return match ? match[0] : '';
+};
+
+const extractCssValue = (css, selector, property) => {
+  const regex = new RegExp(`${selector}\\s*{[^}]*${property}:\\s*([\\d.]+)(px|rem|em)`, 'i');
+  const match = css.match(regex);
+  return match ? { value: parseFloat(match[1]), unit: match[2] } : null;
+};
+
+const updateCssValue = (selector, property, value, unit) => {
+  const regex = new RegExp(`(${selector}\\s*{[^}]*${property}:\\s*)[\\d.]+(px|rem|em)`, 'gi');
+  stylesheetContent.value = stylesheetContent.value.replace(regex, `$1${value}${unit}`);
+};
+
+// Iframe style injection
+const injectStylesToIframe = () => {
+  const iframe = previewFrame.value;
+  if (!iframe?.contentDocument) return;
+
+  let styleElement = iframe.contentDocument.getElementById('dynamic-styles');
+  if (!styleElement) {
+    styleElement = iframe.contentDocument.createElement('style');
+    styleElement.id = 'dynamic-styles';
+    iframe.contentDocument.head.appendChild(styleElement);
+  }
+  styleElement.textContent = stylesheetContent.value;
+};
+
+// Popup handlers
+const handleIframeClick = (event) => {
+  const element = event.target;
+
+  if (element.tagName === 'BODY' || element.tagName === 'HTML') {
+    popupVisible.value = false;
+    return;
+  }
+
+  const selector = element.id
+    ? `#${element.id}`
+    : `.${element.className.split(' ')[0]}`;
+
+  popupSelector.value = selector;
+  popupElementCss.value = extractCssBlock(stylesheetContent.value, selector);
+
+  const fontSizeData = extractCssValue(stylesheetContent.value, selector, 'font-size');
+  popupFontSize.value = fontSizeData?.value ?? null;
+  popupFontSizeUnit.value = fontSizeData?.unit ?? 'rem';
+
+  const rect = element.getBoundingClientRect();
+  const iframeRect = previewFrame.value.getBoundingClientRect();
+  popupPosition.value = {
+    x: iframeRect.left + rect.left,
+    y: iframeRect.top + rect.bottom + 5
+  };
+
+  popupVisible.value = true;
+};
+
+const closePopup = () => {
+  popupVisible.value = false;
+};
+
+const updatePopupFontSize = (newValue) => {
+  updateCssValue(popupSelector.value, 'font-size', newValue, popupFontSizeUnit.value);
+  popupFontSize.value = newValue;
+  popupElementCss.value = extractCssBlock(stylesheetContent.value, popupSelector.value);
+};
+
+// Watchers
+watch(aboutFontSize, (newVal) => {
+  updateCssValue('.about', 'font-size', newVal, aboutFontSizeUnit.value);
+});
+
+watch(stylesheetContent, injectStylesToIframe);
+
+// Initial render
+const renderPreview = async () => {
+  const iframe = previewFrame.value;
+  if (!iframe) return;
+
+  const response = await fetch('/assets/css/stylesheet.css');
+  stylesheetContent.value = await response.text();
+
+  const initialFontSize = extractCssValue(stylesheetContent.value, '.about', 'font-size');
+  if (initialFontSize) {
+    aboutFontSize.value = initialFontSize.value;
+    aboutFontSizeUnit.value = initialFontSize.unit;
+  }
+
+  const contentSource = document.getElementById('content-source');
+  const iframeDoc = iframe.contentDocument;
+
+  iframeDoc.open();
+  iframeDoc.write(`
+    <!DOCTYPE html>
+    <html>
+    <head>
+      <link rel="stylesheet" href="/assets/css/pagedjs-interface.css">
+      <style id="dynamic-styles">${stylesheetContent.value}</style>
+      <style>${printStyles}</style>
+      <script src="https://unpkg.com/pagedjs/dist/paged.polyfill.js"><\/script>
+    </head>
+    <body>${contentSource.innerHTML}</body>
+    </html>
+  `);
+  iframeDoc.close();
+
+  iframe.onload = () => {
+    iframe.contentDocument.addEventListener('click', handleIframeClick);
+  };
+};
+
+onMounted(renderPreview);
+</script>
+
+<template>
+  <div id="content-source" style="display: none">
+    <PagedJsWrapper />
+  </div>
+
+  <EditorPanel
+    :fontSize="aboutFontSize"
+    :unit="aboutFontSizeUnit"
+    @update:fontSize="aboutFontSize = $event"
+  />
+
+  <iframe ref="previewFrame" id="preview-frame"></iframe>
+
+  <StylesheetViewer :stylesheet="stylesheetContent" />
+
+  <ElementPopup
+    :visible="popupVisible"
+    :position="popupPosition"
+    :selector="popupSelector"
+    :elementCss="popupElementCss"
+    :currentFontSize="popupFontSize"
+    :fontSizeUnit="popupFontSizeUnit"
+    @close="closePopup"
+    @update:fontSize="updatePopupFontSize"
+  />
+</template>
+
+<style>
+#preview-frame {
+  position: fixed;
+  top: 0;
+  left: 250px;
+  width: calc(100% - 600px);
+  height: 100vh;
+  border: none;
 }
 </style>
diff --git a/src/assets/print-styles.css b/src/assets/print-styles.css
new file mode 100644
index 0000000..7429227
--- /dev/null
+++ b/src/assets/print-styles.css
@@ -0,0 +1,19 @@
+/* PagedJS print styles */
+@page {
+  size: A4;
+  margin: 20mm 15mm 26mm 15mm;
+}
+
+h2 {
+  break-before: page;
+}
+
+@page {
+  @bottom-center {
+    content: string(title);
+  }
+}
+
+.chapter > h2 {
+  string-set: title content(text);
+}
diff --git a/src/components/EditorPanel.vue b/src/components/EditorPanel.vue
new file mode 100644
index 0000000..e8b157c
--- /dev/null
+++ b/src/components/EditorPanel.vue
@@ -0,0 +1,72 @@
+<template>
+  <aside id="editor-panel">
+    <h3>Éditeur</h3>
+    <div class="control">
+      <label>Font-size .about</label>
+      <input
+        type="number"
+        step="0.1"
+        v-model.number="localFontSize"
+        @input="updateFontSize"
+      />
+      <span>{{ unit }}</span>
+    </div>
+  </aside>
+</template>
+
+<script setup>
+import { ref, watch } from 'vue';
+
+const props = defineProps({
+  fontSize: Number,
+  unit: String,
+});
+
+const emit = defineEmits(['update:fontSize']);
+
+const localFontSize = ref(props.fontSize);
+
+watch(
+  () => props.fontSize,
+  (newVal) => {
+    localFontSize.value = newVal;
+  }
+);
+
+const updateFontSize = () => {
+  emit('update:fontSize', localFontSize.value);
+};
+</script>
+
+<style scoped>
+#editor-panel {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 250px;
+  height: 100vh;
+  background: #f5f5f5;
+  padding: 1rem;
+  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
+  overflow-y: auto;
+}
+
+h3 {
+  margin-top: 0;
+}
+
+.control {
+  margin-bottom: 1rem;
+}
+
+.control label {
+  display: block;
+  margin-bottom: 0.25rem;
+  font-size: 0.875rem;
+}
+
+.control input {
+  width: 80px;
+  padding: 0.25rem;
+}
+</style>
diff --git a/src/components/ElementPopup.vue b/src/components/ElementPopup.vue
new file mode 100644
index 0000000..add01f3
--- /dev/null
+++ b/src/components/ElementPopup.vue
@@ -0,0 +1,152 @@
+<template>
+  <div
+    v-if="visible"
+    id="element-popup"
+    :style="{ top: position.y + 'px', left: position.x + 'px' }"
+  >
+    <div class="popup-header">
+      <span>{{ selector }}</span>
+      <button class="close-btn" @click="$emit('close')">×</button>
+    </div>
+    <div class="popup-body">
+      <div class="popup-controls">
+        <div class="control" v-if="currentFontSize !== null">
+          <label>font-size</label>
+          <input
+            type="number"
+            step="0.1"
+            :value="currentFontSize"
+            @input="$emit('update:fontSize', parseFloat($event.target.value))"
+          />
+          <span>{{ fontSizeUnit }}</span>
+        </div>
+        <p v-else class="no-styles">Aucun style éditable</p>
+      </div>
+      <div class="popup-css">
+        <pre><code class="hljs language-css" v-html="highlightedCss"></code></pre>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue';
+import hljs from 'highlight.js/lib/core';
+import css from 'highlight.js/lib/languages/css';
+import 'highlight.js/styles/github.css';
+
+hljs.registerLanguage('css', css);
+
+const props = defineProps({
+  visible: Boolean,
+  position: Object,
+  selector: String,
+  elementCss: String,
+  currentFontSize: Number,
+  fontSizeUnit: String
+});
+
+defineEmits(['close', 'update:fontSize']);
+
+const highlightedCss = computed(() => {
+  if (!props.elementCss) return '<span class="no-css">Aucun style défini</span>';
+  return hljs.highlight(props.elementCss, { language: 'css' }).value;
+});
+</script>
+
+<style scoped>
+#element-popup {
+  position: fixed;
+  background: white;
+  border-radius: 4px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  z-index: 10000;
+  min-width: 400px;
+  max-width: 500px;
+}
+
+.popup-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 0.5rem 0.75rem;
+  border-bottom: 1px solid #eee;
+  font-size: 0.875rem;
+  font-weight: bold;
+  background: #f5f5f5;
+}
+
+.close-btn {
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 1.25rem;
+  line-height: 1;
+  padding: 0;
+}
+
+.popup-body {
+  display: flex;
+  gap: 1px;
+  background: #eee;
+}
+
+.popup-controls {
+  flex: 1;
+  padding: 0.75rem;
+  background: white;
+}
+
+.popup-css {
+  flex: 1;
+  padding: 0.75rem;
+  background: #1e1e1e;
+  max-height: 200px;
+  overflow-y: auto;
+}
+
+.popup-css pre {
+  margin: 0;
+  font-size: 0.75rem;
+  line-height: 1.4;
+}
+
+.popup-css code {
+  background: transparent;
+  color: #fff;
+}
+
+.control {
+  margin-bottom: 0.5rem;
+}
+
+.control label {
+  display: block;
+  font-size: 0.75rem;
+  margin-bottom: 0.25rem;
+  color: #666;
+}
+
+.control input {
+  width: 60px;
+  padding: 0.25rem;
+  font-size: 0.875rem;
+}
+
+.control span {
+  font-size: 0.75rem;
+  color: #666;
+  margin-left: 0.25rem;
+}
+
+.no-styles {
+  font-size: 0.75rem;
+  color: #999;
+  margin: 0;
+}
+
+.no-css {
+  color: #666;
+  font-style: italic;
+}
+</style>
diff --git a/src/components/PagedJsWrapper.vue b/src/components/PagedJsWrapper.vue
index 8e7c81a..45c7189 100644
--- a/src/components/PagedJsWrapper.vue
+++ b/src/components/PagedJsWrapper.vue
@@ -1,6 +1,33 @@
 <template>
   <section class="chapter">
-    <h2>About</h2>
+    <p class="about">
+      Accumsan arcu tristique purus eros pellentesque rutrum hendrerit phasellus
+      euismod maximus rutrum vivamus dolor erat sollicitudin ut quam metus
+      gravida proin nisl lacus sed lacus. Morbi fusce eros euismod varius ex
+      ipsum erat lacus arcu nunc cursus a scelerisque tristique ipsum congue
+      adipiscing suspendisse facilisis dolor morbi nulla orci massa. Vivamus nec
+      nisl amet eros consectetur ut consectetur phasellus maecenas morbi felis
+      pellentesque pellentesque ipsum ut a arcu sem facilisis eros tempus eu
+      euismod sollicitudin. Nisl facilisis tempus tempus placerat lorem sed leo
+      sit a leo tempus amet tristique felis gravida morbi congue aliquam nunc
+      maximus ipsum ex nisl a. Leo felis leo gravida fusce lacus orci
+      condimentum morbi eros amet portaest sit quam a hendrerit fusce quam
+      tristique arcu id maximus nunc fusce suspendisse.
+    </p>
+    <p class="about">
+      Accumsan arcu tristique purus eros pellentesque rutrum hendrerit phasellus
+      euismod maximus rutrum vivamus dolor erat sollicitudin ut quam metus
+      gravida proin nisl lacus sed lacus. Morbi fusce eros euismod varius ex
+      ipsum erat lacus arcu nunc cursus a scelerisque tristique ipsum congue
+      adipiscing suspendisse facilisis dolor morbi nulla orci massa. Vivamus nec
+      nisl amet eros consectetur ut consectetur phasellus maecenas morbi felis
+      pellentesque pellentesque ipsum ut a arcu sem facilisis eros tempus eu
+      euismod sollicitudin. Nisl facilisis tempus tempus placerat lorem sed leo
+      sit a leo tempus amet tristique felis gravida morbi congue aliquam nunc
+      maximus ipsum ex nisl a. Leo felis leo gravida fusce lacus orci
+      condimentum morbi eros amet portaest sit quam a hendrerit fusce quam
+      tristique arcu id maximus nunc fusce suspendisse.
+    </p>
     <p>
       Lorem ipsum dolor sit amet consectetur adipiscing elit. Duis nibh tortor
     </p>
@@ -12,7 +39,7 @@
   </section>
 
   <section class="chapter">
-    <h2>Chapter 2</h2>
+    <h2 id="chapter-2">Chapter 2</h2>
     <p>consectetur adipiscing elit</p>
   </section>
 
@@ -22,8 +49,6 @@
   </section>
 </template>
 
-<script setup>
-</script>
+<script setup></script>
 
-<style>
-</style>
+<style></style>
diff --git a/src/components/SidePanel.vue b/src/components/SidePanel.vue
new file mode 100644
index 0000000..611fee8
--- /dev/null
+++ b/src/components/SidePanel.vue
@@ -0,0 +1,22 @@
+<template>
+  <aside id="side-panel">
+    <button @click="fontSize++">Action ({{ fontSize }}px)</button>
+  </aside>
+</template>
+
+<script setup>
+const fontSize = defineModel('fontSize');
+</script>
+
+<style>
+#side-panel {
+  position: fixed;
+  top: 0;
+  right: 0;
+  width: 300px;
+  height: 100vh;
+  background: white;
+  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
+  padding: 1rem;
+}
+</style>
diff --git a/src/components/StylesheetViewer.vue b/src/components/StylesheetViewer.vue
new file mode 100644
index 0000000..a0dbcf9
--- /dev/null
+++ b/src/components/StylesheetViewer.vue
@@ -0,0 +1,54 @@
+<template>
+  <aside id="stylesheet-viewer">
+    <h3>Stylesheet</h3>
+    <pre><code class="hljs language-css" v-html="highlightedCss"></code></pre>
+  </aside>
+</template>
+
+<script setup>
+import { computed } from 'vue';
+import hljs from 'highlight.js/lib/core';
+import css from 'highlight.js/lib/languages/css';
+import 'highlight.js/styles/github.css';
+
+hljs.registerLanguage('css', css);
+
+const props = defineProps({
+  stylesheet: String
+});
+
+const highlightedCss = computed(() => {
+  if (!props.stylesheet) return '';
+  return hljs.highlight(props.stylesheet, { language: 'css' }).value;
+});
+</script>
+
+<style scoped>
+#stylesheet-viewer {
+  position: fixed;
+  top: 0;
+  right: 0;
+  width: 350px;
+  height: 100vh;
+  background: #1e1e1e;
+  padding: 1rem;
+  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
+  overflow-y: auto;
+  color: #fff;
+}
+
+h3 {
+  margin-top: 0;
+  color: #fff;
+}
+
+pre {
+  margin: 0;
+  font-size: 0.75rem;
+  line-height: 1.4;
+}
+
+code {
+  background: transparent;
+}
+</style>