diff --git a/app.py b/app.py
index 3f613ab..905ab49 100644
--- a/app.py
+++ b/app.py
@@ -373,7 +373,7 @@ def md(text, expand_magic=False, toc=True, math=True):
         extensions.append('markdown_katex')
         extension_configs['markdown_katex'] = {
             'no_inline_svg': True,
-            'insert_fonts_css': True
+            'insert_fonts_css': not _getconf('site', 'katex_url')
         }
     try:
         return markdown.Markdown(extensions=extensions, extension_configs=extension_configs).convert(text)
@@ -446,7 +446,8 @@ def _inject_variables():
         'strong': lambda x:Markup('<strong>{0}</strong>').format(x),
         'app_version': __version__,
         'math_version': markdown_katex.__version__ if markdown_katex else None,
-        'material_icons_url': _getconf('site', 'material_icons_url')
+        'material_icons_url': _getconf('site', 'material_icons_url'),
+        'katex_url': _getconf('site', 'katex_url')
     }
 
 @login_manager.user_loader
diff --git a/i18n/salvi.en.json b/i18n/salvi.en.json
index 3a39f35..02db2f8 100644
--- a/i18n/salvi.en.json
+++ b/i18n/salvi.en.json
@@ -36,6 +36,9 @@
         "username": "Username",
         "password": "Password",
         "no-account-sign-up": "Don’t have an account?",
-        "sign-up": "Sign up"
+        "sign-up": "Sign up",
+        "not-found": "Not found",
+        "not-found-text-1": "The page at",
+        "not-found-text-2": "does not exist."
     }
 }
\ No newline at end of file
diff --git a/i18n/salvi.it.json b/i18n/salvi.it.json
index a746c5c..bd20613 100644
--- a/i18n/salvi.it.json
+++ b/i18n/salvi.it.json
@@ -34,6 +34,9 @@
         "back-to": "Torna a",
         "login": "Entra",
         "username": "Nome utente",
-        "password": "Password"
+        "password": "Password",
+        "not-found": "Non trovato",
+        "not-found-text-1": "La pagina con url",
+        "not-found-text-2": "non esiste"
     }
 }
\ No newline at end of file
diff --git a/templates/base.html b/templates/base.html
index fc6f0a1..f72a183 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -12,6 +12,19 @@
     {% else %}
     <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
     {% endif %}
+    {% if math_version and katex_url %}
+    <link rel="stylesheet" href="{{ katex_url }}" />
+    <style type="text/css">
+    .katex img {
+      object-fit: fill;
+      padding: unset;
+      display: block;
+      position: absolute;
+      width: 100%;
+      height: inherit;
+    }
+    </style>
+    {% endif %}
     {% block json_info %}{% endblock %}
   </head>
   <body{% if request.cookies.get('dark') == '1' %} class="dark"{% endif %}>
diff --git a/templates/notfound.html b/templates/notfound.html
index 5065bd8..0bd7f79 100644
--- a/templates/notfound.html
+++ b/templates/notfound.html
@@ -3,7 +3,7 @@
 {% block title %}Not found - {{ app_name }}{% endblock %}
 
 {% block content %}
-<h1>Not Found</h1>
+<h1>{{ T('not-found') }}</h1>
 
-<p>The url at <strong>{{ request.path }}</strong> does not exist.</p>
+<p>{{ T('not-found-text-1')}} <strong>{{ request.path }}</strong> {{ T('not-found-text-2' )}}.</p>
 {% endblock %}