diff --git a/src/docgen/templates/base.html.jinja2 b/src/docgen/templates/base.html.jinja2
new file mode 100644
index 0000000..2099b4c
--- /dev/null
+++ b/src/docgen/templates/base.html.jinja2
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{ title }} - API Documentation</title>
+    <link rel="stylesheet" href="/static/style.css">
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
+</head>
+<body class="theme-{{ theme }}">
+    <nav class="sidebar">
+        <div class="sidebar-header">
+            <h1>{{ title }}</h1>
+            <span class="version-badge">v{{ version }}</span>
+        </div>
+        <div class="sidebar-content">
+            {{ sidebar | safe }}
+        </div>
+        <div class="sidebar-footer">
+            <p>Generated by DocGen-CLI</p>
+        </div>
+    </nav>
+    
+    <main class="main-content">
+        <div class="content-wrapper">
+            {% if description %}
+            <div class="api-description">
+                {{ description }}
+            </div>
+            {% endif %}
+            
+            {% for tag, tag_endpoints in grouped_endpoints.items() %}
+            <section class="endpoint-group" id="group-{{ tag | slugify }}">
+                <h2 class="group-title">{{ tag }}</h2>
+                
+                {% for endpoint in tag_endpoints %}
+                <article class="endpoint-card" id="endpoint-{{ endpoint.path | slugify }}-{{ endpoint.method.value | lower }}">
+                    {% include "endpoint.html.jinja2" %}
+                </article>
+                {% endfor %}
+            </section>
+            {% endfor %}
+        </div>
+    </main>
+    
+    <script src="/static/script.js"></script>
+</body>
+</html>
