diff --git a/Cargo.toml b/Cargo.toml
index 6c8d9cb..20a8c40 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rustpad"
-version = "0.0.13"
+version = "0.0.14"
 edition = "2024"
 rust-version = "1.94"
 description = "Collaborative Markdown notepad built with Axum, WebSockets and SQLite, PostgreSQL and MySQL"
diff --git a/static/css/styles.css b/static/css/styles.css
index bbb1666..f71f500 100644
--- a/static/css/styles.css
+++ b/static/css/styles.css
@@ -1292,7 +1292,7 @@ dialog::backdrop {
 
 .public-content {
   min-height: 240px;
-  padding: 32px;
+  padding: 32px 32px 32px 62px;
   border: 1px solid var(--border);
   border-radius: 14px;
   background: var(--surface);
@@ -1308,7 +1308,7 @@ dialog::backdrop {
   }
 
   .public-content {
-    padding: 20px;
+    padding: 20px 20px 20px 52px;
   }
 }
 
@@ -2179,13 +2179,15 @@ dialog::backdrop {
 }
 
 .preview-source-line {
+  position: relative;
   min-height: 1.32em;
 }
 
 .preview-source-line::before {
   content: attr(data-source-line);
   position: absolute;
-  left: 12px;
+  top: 0;
+  left: -50px;
   width: 32px;
   color: #596270;
   text-align: right;
diff --git a/static/js/api.js b/static/js/api.js
index 16edb53..0980ea1 100644
--- a/static/js/api.js
+++ b/static/js/api.js
@@ -14,7 +14,7 @@ export async function api(path, options = {}) {
     const contentType = response.headers.get("content-type") || "";
     const data = contentType.includes("application/json") ? await response.json().catch(() => ({})) : {};
     if (!response.ok) {
-      const defaults = { 400: "Invalid request.", 401: "Authentication required.", 403: "Access denied.", 404: "The requested resource was not found.", 405: "This operation is not allowed.", 409: "The requested change conflicts with existing data.", 413: "The uploaded data is too large.", 429: "Too many requests. Try again later.", 500: "Server error. Try again later.", 503: "Service temporarily unavailable." };
+      const defaults = { 400: "Invalid request.", 401: "Authentication required.", 403: "Access denied.", 404: "The requested resource was not found.", 405: "This operation is not allowed.", 409: "The requested change conflicts with existing data.", 413: "The selected file exceeds the allowed upload limit.", 429: "Too many requests. Try again later.", 500: "Server error. Try again later.", 503: "Service temporarily unavailable." };
       const requestError = new Error(data.error || defaults[response.status] || `Request failed (${response.status}).`);
       requestError.status = response.status;
       logWarn("api.failed", { method: options.method || "GET", path, status: response.status, message: requestError.message });
diff --git a/static/js/editor-format.js b/static/js/editor-format.js
index cd05c00..daa9ef4 100644
--- a/static/js/editor-format.js
+++ b/static/js/editor-format.js
@@ -50,7 +50,14 @@ export function applyFormat(editor, format) {
   if (format === "subscript") toggleWrap(editor, "~", "~", "2");
   if (format === "superscript") toggleWrap(editor, "^", "^", "2");
   if (format === "codeblock") toggleWrap(editor, "```text\n", "\n```", "code");
+  if (format === "codeblock-lines") toggleWrap(editor, "```text=\n", "\n```", "code");
+  if (format === "mermaid") toggleWrap(editor, "```mermaid\n", "\n```", "graph TD\n  A[Start] --> B[End]");
   if (format === "details") toggleWrap(editor, "<details>\n<summary>Click me</summary>\n\n", "\n</details>", "Content");
+  if (format === "toc") toggleWrap(editor, "", "", "[TOC]");
+  if (format.startsWith("alert-")) {
+    const type = format.slice("alert-".length);
+    toggleWrap(editor, `:::${type}\n`, "\n:::", "Alert content");
+  }
   if (format === "table") toggleWrap(editor, "| Column 1 | Column 2 |\n| --- | --- |\n| ", " | value |", "value");
   if (format === "footnote") toggleWrap(editor, "", "[^1]\n\n[^1]: Footnote text", "Text with footnote");
   if (format === "definition") toggleWrap(editor, "", "\n: Definition", "Term");
diff --git a/static/note.html b/static/note.html
index af866ed..d0af508 100644
--- a/static/note.html
+++ b/static/note.html
@@ -46,9 +46,16 @@
                     <details class="markdown-more">
                         <summary title="Extended Markdown">More</summary>
                         <div class="markdown-more-menu"><button type="button" data-format="details">Collapsible
-                                section</button><button type="button" data-format="inline-code">Inline
+                                section</button><button type="button" data-format="toc">Table of
+                                contents</button><button type="button" data-format="alert-success">Success
+                                alert</button><button type="button" data-format="alert-info">Info
+                                alert</button><button type="button" data-format="alert-warning">Warning
+                                alert</button><button type="button" data-format="alert-danger">Danger
+                                alert</button><button type="button" data-format="inline-code">Inline
                                 code</button><button type="button" data-format="codeblock">Code block</button><button
-                                type="button" data-format="table">Table</button><button type="button"
+                                type="button" data-format="codeblock-lines">Code block with line
+                                numbers</button><button type="button" data-format="mermaid">Mermaid
+                                diagram</button><button type="button" data-format="table">Table</button><button type="button"
                                 data-format="footnote">Footnote</button><button type="button"
                                 data-format="definition">Definition</button><button type="button"
                                 data-format="highlight">Highlight</button><button type="button"
diff --git a/static/pad.html b/static/pad.html
index bb61ad8..9ff767f 100644
--- a/static/pad.html
+++ b/static/pad.html
@@ -45,9 +45,16 @@
                     <details class="markdown-more">
                         <summary title="Extended Markdown">More</summary>
                         <div class="markdown-more-menu"><button type="button" data-format="details">Collapsible
-                                section</button><button type="button" data-format="inline-code">Inline
+                                section</button><button type="button" data-format="toc">Table of
+                                contents</button><button type="button" data-format="alert-success">Success
+                                alert</button><button type="button" data-format="alert-info">Info
+                                alert</button><button type="button" data-format="alert-warning">Warning
+                                alert</button><button type="button" data-format="alert-danger">Danger
+                                alert</button><button type="button" data-format="inline-code">Inline
                                 code</button><button type="button" data-format="codeblock">Code block</button><button
-                                type="button" data-format="table">Table</button><button type="button"
+                                type="button" data-format="codeblock-lines">Code block with line
+                                numbers</button><button type="button" data-format="mermaid">Mermaid
+                                diagram</button><button type="button" data-format="table">Table</button><button type="button"
                                 data-format="footnote">Footnote</button><button type="button"
                                 data-format="definition">Definition</button><button type="button"
                                 data-format="highlight">Highlight</button><button type="button"