diff --git a/app.py b/app.py
index 5fa799f..0eba4cb 100644
--- a/app.py
+++ b/app.py
@@ -46,10 +46,10 @@ app.config['UPLOAD_FOLDER'] = os.getenv('UPLOAD_FOLDER', os.path.join(os.getcwd(
 app.config['WTF_CSRF_ENABLED'] = False
 
 # OpenAI API-Konfiguration
-api_key = os.environ.get("OPENAI_API_KEY")
-if not api_key:
-    print("WARNUNG: Kein OPENAI_API_KEY in Umgebungsvariablen gefunden. KI-Funktionalität wird nicht verfügbar sein.")
-    api_key = "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"
+api_key = "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"
+# api_key = os.environ.get("OPENAI_API_KEY")
+# if not api_key:
+#     print("WARNUNG: Kein OPENAI_API_KEY in Umgebungsvariablen gefunden. KI-Funktionalität wird nicht verfügbar sein.")
 
 client = OpenAI(api_key=api_key)
 
diff --git a/static/img/default-avatar.svg b/static/img/default-avatar.svg
index 0519ecb..a8e196f 100644
--- a/static/img/default-avatar.svg
+++ b/static/img/default-avatar.svg
@@ -1 +1,11 @@
- 
\ No newline at end of file
+<svg width="200" height="200" viewBox="0 0 200 200" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <circle cx="100" cy="100" r="98" fill="url(#gradient)" stroke="#7C3AED" stroke-width="4"/>
+  <circle cx="100" cy="80" r="36" fill="white"/>
+  <path d="M100 140C77.9086 140 60 157.909 60 180H140C140 157.909 122.091 140 100 140Z" fill="white"/>
+  <defs>
+    <linearGradient id="gradient" x1="0" y1="0" x2="200" y2="200" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#8B5CF6"/>
+      <stop offset="1" stop-color="#3B82F6"/>
+    </linearGradient>
+  </defs>
+</svg> 
\ No newline at end of file
diff --git a/templates/base.html b/templates/base.html
index 7bfc29d..46e6551 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -459,12 +459,11 @@
                                 {% if current_user.avatar %}
                                 <img src="{{ current_user.avatar }}" alt="{{ current_user.username }}" class="w-full h-full object-cover">
                                 {% else %}
-                                {{ current_user.username[0].upper() }}
+                                <img src="{{ url_for('static', filename='img/default-avatar.svg') }}" alt="{{ current_user.username }}" class="w-full h-full object-cover">
                                 {% endif %}
                             </div>
-                            <span class="text-sm hidden lg:block">{{ current_user.username }}</span>
-                            <i class="fa-solid fa-chevron-down text-xs hidden lg:block transition-transform duration-200"
-                               x-bind:class="open ? 'transform rotate-180' : ''"></i>
+                            <span class="hidden md:block">{{ current_user.username }}</span>
+                            <i class="fas fa-chevron-down text-xs opacity-60 ml-1.5"></i>
                         </button>
 
                         <!-- Dropdown-Menü -->
diff --git a/templates/profile.html b/templates/profile.html
index 5d4ea51..6c8db10 100644
--- a/templates/profile.html
+++ b/templates/profile.html
@@ -583,7 +583,7 @@
     <!-- User Info Section -->
     <div class="profile-header">
       <div class="avatar-container">
-        <img src="{{ user.avatar if user.avatar else url_for('static', filename='img/default-avatar.png') }}" alt="Profilbild" class="avatar">
+        <img src="{{ user.avatar if user.avatar else url_for('static', filename='img/default-avatar.svg') }}" alt="Profilbild" class="avatar">
         <div class="avatar-edit">
           <i class="fas fa-camera"></i>
         </div>