diff --git a/app.py b/app.py
index cf3553c..a8c90d9 100644
--- a/app.py
+++ b/app.py
@@ -1,7 +1,6 @@
 import datetime
 import hashlib
 import os
-# import imageio
 from PIL import Image
 
 from flask import Flask, render_template, redirect, url_for, request, jsonify
@@ -16,6 +15,8 @@ from utils import anonymous_required
 # Create a new Flask instance
 app = Flask(__name__)
 app.secret_key = 'PSSSSSHHHT!'
+UPLOAD_FOLDER = 'static/profile_images/'  # Folder to store profile images
+app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
 
 # Initialize the Flask-Login extension
 login_manager = LoginManager()
@@ -244,7 +245,7 @@ def habit_create():
         unit = 1
 
     # Save habit to database
-    habit = Habit.create(list_id, name, times, note, unit)
+    Habit.create(list_id, name, times, note, unit)
 
     # Back to index
     return redirect(url_for('index'))
@@ -271,7 +272,7 @@ def habit_list_create():
     if not name:
         errors['name'] = 'Der Name ist erforderlich.'
     if not description:
-        note = ''
+        description = ''
 
     if errors:
         return render_template(
@@ -283,7 +284,7 @@ def habit_list_create():
         )
 
     # Save habit to database
-    habit = HabitList.create(current_user.id, name, description)
+    HabitList.create(current_user.id, name, description)
 
     # Back to index
     return redirect(url_for('index'))
@@ -387,7 +388,7 @@ def edit_habit_change():
 
     # check if list_id is an int
     try:
-        list_id = int(list_id)
+        int(list_id)
     except ValueError:
         errors['list_query'] = 'Die Anzahl muss eine Zahl sein.'
 
@@ -466,9 +467,6 @@ def password_change():
 
 
 def save_profile_image(image_file):
-    UPLOAD_FOLDER = 'static/profile_images/'  # Folder to store profile images
-    app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
-
     filename = image_file.filename
     if '.' not in filename:
         # Ensure the filename has an extension
diff --git a/models/User.py b/models/User.py
index a736136..8f8f03f 100644
--- a/models/User.py
+++ b/models/User.py
@@ -65,7 +65,7 @@ class User(UserMixin):
     def get_heatmap(self) -> tuple:
         # get current day of week as integer. monday is 0 and sunday is 6
         weekday = datetime.today().weekday()
-        heatmap = []
+        heatmap = [100]
 
         # append the heatmap values of the current week
         for day in range(0, weekday):
diff --git a/templates/components/habit_lists.html b/templates/components/habit_lists.html
index 76f6de7..b8c16c9 100644
--- a/templates/components/habit_lists.html
+++ b/templates/components/habit_lists.html
@@ -103,9 +103,7 @@
                 <div class="col">
                     <a href="/users?habit_list={{habit_list.id}}" style="width: 40px; height: 40px; min-height: 3em;"
                        data-toggle="tooltip" data-placement="top" title="Benutzer einladen">
-
-                        <i class="bi bi-person-fill-add"></i>
-
+                        <i class="bi bi-person-fill-add" style="font-size: 24px;"></i>
                     </a>
                 </div>
                 {% else %}
diff --git a/templates/users.html b/templates/users.html
index e17ee21..fb6d1d9 100644
--- a/templates/users.html
+++ b/templates/users.html
@@ -16,7 +16,9 @@
             </div>
         </div>
 
-        <input hidden="hidden" name="habit_list_id" value="{{ habit_list.id }}">
+        <label>
+            <input hidden="hidden" name="habit_list_id" value="{{ habit_list.id }}">
+        </label>
 
         <!-- submit button -->
         <button type="submit" class="btn btn-primary">Einladen</button>