diff --git a/backend/src/main/resources/html-sanitization-config.json b/backend/src/main/resources/html-sanitization-config.json
index b6779d6..f1bd063 100644
--- a/backend/src/main/resources/html-sanitization-config.json
+++ b/backend/src/main/resources/html-sanitization-config.json
@@ -5,7 +5,8 @@
     "sup", "sub", "small", "big", "mark", "pre", "code", "kbd", "samp", "var",
     "ul", "ol", "li", "dl", "dt", "dd",
     "a", "table", "thead", "tbody", "tfoot", "tr", "th", "td", "caption", "colgroup", "col",
-    "blockquote", "cite", "q", "hr", "details", "summary"
+    "blockquote", "cite", "q", "hr", "details", "summary",
+    "section", "article", "font", "center", "abbr", "dfn", "tt"
   ],
   "allowedAttributes": {
     "p": ["class", "style"],
@@ -32,12 +33,44 @@
     "pre": ["class", "style"],
     "code": ["class", "style"],
     "details": ["class", "style"],
-    "summary": ["class", "style"]
+    "summary": ["class", "style"],
+    "section": ["class", "style"],
+    "article": ["class", "style"],
+    "font": ["class", "style", "color", "size", "face"],
+    "center": ["class", "style"],
+    "abbr": ["class", "style", "title"],
+    "dfn": ["class", "style"],
+    "tt": ["class", "style"],
+    "b": ["class", "style"],
+    "strong": ["class", "style"],
+    "i": ["class", "style"],
+    "em": ["class", "style"],
+    "u": ["class", "style"],
+    "s": ["class", "style"],
+    "small": ["class", "style"],
+    "big": ["class", "style"],
+    "mark": ["class", "style"],
+    "sup": ["class", "style"],
+    "sub": ["class", "style"],
+    "del": ["class", "style"],
+    "ins": ["class", "style"],
+    "strike": ["class", "style"],
+    "kbd": ["class", "style"],
+    "samp": ["class", "style"],
+    "var": ["class", "style"]
   },
   "allowedCssProperties": [
     "color", "background-color", "font-size", "font-weight", 
     "font-style", "text-align", "text-decoration", "margin", 
-    "padding", "text-indent", "line-height"
+    "padding", "text-indent", "line-height",
+    "border", "border-color", "border-width", "border-style",
+    "font-family", "font-variant", "font-variant-ligatures", 
+    "font-variant-caps", "font-variant-numeric", "font-variant-east-asian",
+    "font-variant-alternates", "font-variant-position", "font-variant-emoji",
+    "font-stretch", "letter-spacing", "word-spacing",
+    "text-transform", "text-shadow", "white-space",
+    "vertical-align", "display", "float", "clear",
+    "width", "height", "min-width", "min-height", "max-width", "max-height"
   ],
   "removedAttributes": {
     "a": ["href", "target"]
diff --git a/frontend/src/components/stories/RichTextEditor.tsx b/frontend/src/components/stories/RichTextEditor.tsx
index 62fda84..7935f35 100644
--- a/frontend/src/components/stories/RichTextEditor.tsx
+++ b/frontend/src/components/stories/RichTextEditor.tsx
@@ -3,7 +3,7 @@
 import { useState, useRef, useEffect } from 'react';
 import { Textarea } from '../ui/Input';
 import Button from '../ui/Button';
-import { sanitizeHtmlSync, preloadSanitizationConfig } from '../../lib/sanitization';
+import { sanitizeHtmlSync } from '../../lib/sanitization';
 
 interface RichTextEditorProps {
   value: string;
@@ -25,7 +25,11 @@ export default function RichTextEditor({
 
   // Preload sanitization config
   useEffect(() => {
-    preloadSanitizationConfig().catch(console.error);
+    // Clear cache and reload config to get latest sanitization rules
+    import('../../lib/sanitization').then(({ clearSanitizationCache, preloadSanitizationConfig }) => {
+      clearSanitizationCache();
+      preloadSanitizationConfig().catch(console.error);
+    });
   }, []);
 
   const handleVisualChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
@@ -109,7 +113,15 @@ export default function RichTextEditor({
         console.log('Raw HTML:', htmlContent.substring(0, 500));
         
         const sanitizedHtml = sanitizeHtmlSync(htmlContent);
-        console.log('Sanitized HTML:', sanitizedHtml.substring(0, 500));
+        console.log('Sanitized HTML length:', sanitizedHtml.length);
+        console.log('Sanitized HTML preview:', sanitizedHtml.substring(0, 500));
+        
+        // Check if sanitization removed too much content
+        const ratio = sanitizedHtml.length / htmlContent.length;
+        console.log('Sanitization ratio (kept/original):', ratio.toFixed(3));
+        if (ratio < 0.1) {
+          console.warn('Sanitization removed >90% of content - this might be too aggressive');
+        }
         
         // Insert at cursor position instead of just appending
         const textarea = visualTextareaRef.current;