Update article tile button styles in index.html to improve responsiveness and visual consistency

Made-with: Cursor

.gitignore

@@ -1,3 +1,4 @@
 .venv/
 log/
 __pycache__/
+*.db

README.md

@@ -66,9 +66,19 @@ touch kasse.db
 docker run -p 9090:90 -v $(pwd)/kasse.db:/app/kasse.db -t erdbeerhannah:latest
 ```
 
+### Nginx Reverse-Proxy
+
+Bei 502 Bad Gateway hinter nginx:
+
+1. **Proxy-Header**: Nginx muss `X-Forwarded-For`, `X-Forwarded-Proto`, `Host` setzen (die App nutzt `ProxyFix`).
+2. **Upstream-Erreichbarkeit**: `proxy_pass` muss den Container erreichen:
+   - nginx auf gleichem Host wie Docker: `http://127.0.0.1:9090`
+   - nginx auf anderem Host: `http://<Docker-Host-IP>:9090`
+3. **Beispielkonfiguration**: Siehe `nginx-proxy.example.conf`
+
 ## Privatsphäre
 
-Die App *erdbeerhannah* protokolliert keinerlei Daten. Keine IP-Adressen, keine Klicks, keine Benutzer-Eingaben und auch sonst nichts. Es werden keine Cookies genutzt, es findet kein Tracking statt und es gibt keine Werbung.
+Die App *erdbeerhannah* protokolliert keine personenbezogenen Daten. Keine IP-Adressen und keine persönlichen Benutzer-Eingaben. Es werden keine Cookies genutzt. Zur reinen Nutzungsstatistik (Seitenaufrufe) verwenden wir das datenschutzfreundliche, Cookie-lose [Plausible Analytics](https://plausible.io/). Es gibt keine Werbung.
 
 ## Lizenz
 

app.py

@@ -1,13 +1,16 @@
+import math
 import os
 import time
 import logging
 import sqlite3
 import uuid
 from werkzeug.security import generate_password_hash, check_password_hash
+from werkzeug.middleware.proxy_fix import ProxyFix
 from flask import Flask, render_template, request, session, send_from_directory, g, redirect, url_for
 from flask_bootstrap import Bootstrap
 
 app = Flask(__name__)
+app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1)
 app.config['SECRET_KEY'] = 'j69ol5mcHLsEtLg4Y/+myd9wWD4pp56E'
 
 # setup logging
@@ -21,7 +24,7 @@ app.logger.addHandler(handler)
 
 Bootstrap(app)
 
-version = "1.1.0/2026-02-24"
+version = "1.1.1/2026-03-22"
 
 def get_db_connection():
     conn = sqlite3.connect('kasse.db')
@@ -110,7 +113,7 @@ def index(instance_id):
     gesamtwert = session.get(f'{session_prefix}gesamtwert', 0.0)
     change = session.get(f'{session_prefix}change', "0.00")
     givenfloat = session.get(f'{session_prefix}given', 0.0)
-    items = {i: session.get(f'{session_prefix}item{i}', 0) for i in range(1, 7)}
+    items = {p: session.get(f'{session_prefix}item{p}', 0) for p in products}
     
     background = "bg-white"
     
@@ -122,7 +125,7 @@ def index(instance_id):
             gesamtwert = 0.0
             change = "0.00"
             givenfloat = 0.0
-            items = {i: 0 for i in range(1, 7)}
+            items = {p: 0 for p in products}
             background = "bg-white"
         elif action == "calculate_change":
             given = request.form.get('given', "0", type=float)
@@ -138,15 +141,21 @@ def index(instance_id):
         session[f'{session_prefix}gesamtwert'] = round(gesamtwert, 2)
         session[f'{session_prefix}change'] = change
         session[f'{session_prefix}given'] = round(givenfloat, 2)
-        for i in range(1, 7):
+        for p in products:
-            session[f'{session_prefix}item{i}'] = items[i]
+            session[f'{session_prefix}item{p}'] = items[p]
             
         # Update our local variables after processing so they reflect what is rendered
         gesamtwert = round(gesamtwert, 2)
 
+    n = len(products)
+    grid_cols = math.ceil(math.sqrt(n)) if n else 1
+    grid_rows = math.ceil(n / grid_cols) if n else 1
+
     return render_template("index.html", 
         instance_id=instance_id,
         products=products,
+        grid_cols=grid_cols,
+        grid_rows=grid_rows,
         gesamtwert=f"{gesamtwert:.2f}",
         change=change,
         given=f"{givenfloat:.2f}" if givenfloat > 0 else "0",
@@ -165,9 +174,21 @@ def admin(instance_id):
         
     auth_key = f'admin_auth_{instance_id}'
     
+    # Check if instance has no password (empty or None)
+    stored_password = instance['password']
+    has_no_password = (
+        stored_password is None or
+        check_password_hash(stored_password, '')
+    )
+
     # Handle Login Submission
     if request.method == "POST" and 'admin_password' in request.form:
-        if check_password_hash(instance['password'], request.form['admin_password']):
+        entered = request.form['admin_password']
+        if has_no_password and entered == '':
+            session[auth_key] = True
+            conn.close()
+            return redirect(url_for('admin', instance_id=instance_id))
+        elif not has_no_password and check_password_hash(stored_password, entered):
             session[auth_key] = True
             conn.close()
             return redirect(url_for('admin', instance_id=instance_id))
@@ -191,18 +212,56 @@ def admin(instance_id):
             session.pop(auth_key, None)
             return redirect(url_for('landing'))
 
-        # Additional safety: Ensure that the post request isn't processed if not authenticated
+        for key in request.form:
-        # (Though we checked above, this is for the product update form submission)
+            if key.startswith('delete_') and request.form[key]:
-        for i in range(1, 7):
+                pos = int(key.split('_')[1])
-            name = request.form.get(f'name_{i}')
+                conn.execute('DELETE FROM products WHERE instance_id = ? AND position = ?',
-            price = request.form.get(f'price_{i}', type=float)
+                             (instance_id, pos))
-            icon = request.form.get(f'icon_{i}')
+                conn.commit()
-            color = request.form.get(f'color_{i}')
+                conn.close()
+                return redirect(url_for('admin', instance_id=instance_id))
+
+        if action == "add_product":
+            name = request.form.get('add_name', '').strip()
+            price_str = request.form.get('add_price', '').replace(',', '.').strip()
+            try:
+                price = float(price_str) if price_str else None
+            except ValueError:
+                price = None
+            icon = request.form.get('add_icon', '🛒').strip() or '🛒'
+            color = request.form.get('add_color', 'btn-primary')
+            if name and price is not None:
+                max_pos = conn.execute(
+                    'SELECT COALESCE(MAX(position), 0) FROM products WHERE instance_id = ?',
+                    (instance_id,)
+                ).fetchone()[0]
+                conn.execute(
+                    'INSERT INTO products (instance_id, position, name, price, icon, color_class) VALUES (?, ?, ?, ?, ?, ?)',
+                    (instance_id, max_pos + 1, name, price, icon, color)
+                )
+            conn.commit()
+            conn.close()
+            return redirect(url_for('admin', instance_id=instance_id))
+            
+        # Update existing products
+        products_rows = conn.execute(
+            'SELECT position FROM products WHERE instance_id = ?', (instance_id,)
+        ).fetchall()
+        for row in products_rows:
+            pos = row['position']
+            name = request.form.get(f'name_{pos}')
+            price_str = request.form.get(f'price_{pos}', '').replace(',', '.').strip()
+            try:
+                price = float(price_str) if price_str else None
+            except ValueError:
+                price = None
+            icon = request.form.get(f'icon_{pos}')
+            color = request.form.get(f'color_{pos}')
             if name is not None and price is not None:
                 conn.execute('''
                     UPDATE products SET name = ?, price = ?, icon = ?, color_class = ?
                     WHERE instance_id = ? AND position = ?
-                ''', (name, price, icon, color, instance_id, i))
+                ''', (name, price, icon, color, instance_id, pos))
         conn.commit()
         conn.close()
         return redirect(url_for('index', instance_id=instance_id))

docker-compose.yml

@@ -0,0 +1,10 @@
+# Vor dem ersten Start: touch kasse.db (bzw. echo. > kasse.db unter Windows)
+# damit Docker keine Verzeichnis-Datei erstellt
+services:
+  erdbeerkasse:
+    build: .
+    container_name: erdbeerkasse
+    ports:
+      - "9090:90"
+    volumes:
+      - ./kasse.db:/app/kasse.db

nginx-proxy.example.conf

@@ -0,0 +1,29 @@
+# Beispiel nginx Reverse-Proxy Konfiguration für erdbeerhannah
+# Pfad anpassen, z.B. /etc/nginx/sites-available/erdbeerhannah
+#
+# Upstream-URL je nach Deployment:
+# - nginx auf gleichem Host wie Docker: http://127.0.0.1:9090
+# - nginx auf anderem Host: http://10.7.0.5:9090 (Docker-Host-IP)
+# - Beide im gleichen docker-compose: http://erdbeerkasse:90
+
+server {
+    listen 443 ssl http2;
+    server_name erdbeerhannah.elpatron.me;
+
+    # SSL-Zertifikate
+    ssl_certificate /pfad/zu/cert.pem;
+    ssl_certificate_key /pfad/zu/key.pem;
+
+    location / {
+        proxy_pass http://127.0.0.1:9090;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_read_timeout 60s;
+        proxy_connect_timeout 60s;
+        proxy_send_timeout 60s;
+    }
+}

templates/admin.html

@@ -9,6 +9,7 @@
     <link rel="manifest" href="/manifest.json">
     <meta name="theme-color" content="#dc3545">
     <link rel="apple-touch-icon" href="/static/icon-192x192.png">
+    <script defer data-domain="erdbeerhannah.elpatron.me" src="https://plausible.elpatron.me/js/script.js"></script>
 </head>
 
 <body class="bg-light">
@@ -30,21 +31,26 @@
                         <th>Preis (€)</th>
                         <th>Icon/Emoji</th>
                         <th>Farbe (Bootstrap Klasse)</th>
+                        <th></th>
                     </tr>
                 </thead>
                 <tbody>
-                    {% for i in range(1, 7) %}
+                    {% if not products %}
-                    {% set prod = products[i] %}
                     <tr>
-                        <td class="align-middle">{{ i }}</td>
+                        <td colspan="6" class="text-muted text-center py-4">Keine Artikel. Füge unten einen neuen hinzu.</td>
-                        <td><input type="text" class="form-control" name="name_{{ i }}" value="{{ prod['name'] }}"
+                    </tr>
+                    {% endif %}
+                    {% for pos, prod in products|dictsort %}
+                    <tr>
+                        <td class="align-middle">{{ pos }}</td>
+                        <td><input type="text" class="form-control" name="name_{{ pos }}" value="{{ prod['name'] }}"
                                 required></td>
-                        <td><input type="number" step="0.01" class="form-control" name="price_{{ i }}"
+                        <td><input type="text" inputmode="decimal" class="form-control" name="price_{{ pos }}"
-                                value="{{ prod['price'] }}" required></td>
+                                value="{{ '{:.2f}'.format(prod['price']).replace('.', ',') }}" required></td>
-                        <td><input type="text" class="form-control" name="icon_{{ i }}" value="{{ prod['icon'] }}"
+                        <td><input type="text" class="form-control" name="icon_{{ pos }}" value="{{ prod['icon'] }}"
                                 required></td>
                         <td>
-                            <select class="form-control" name="color_{{ i }}">
+                            <select class="form-control" name="color_{{ pos }}">
                                 <option value="btn-primary" {% if prod['color_class']=='btn-primary' %}selected{% endif
                                     %}>Blau (Primary)</option>
                                 <option value="btn-secondary" {% if prod['color_class']=='btn-secondary' %}selected{%
@@ -61,6 +67,12 @@
                                     Schwarz (Dark)</option>
                             </select>
                         </td>
+                        <td class="align-middle">
+                            {% if products|length > 1 %}
+                            <button type="submit" name="delete_{{ pos }}" value="1" class="btn btn-outline-danger btn-sm"
+                                onclick="return confirm('Artikel wirklich löschen?');">Löschen</button>
+                            {% endif %}
+                        </td>
                     </tr>
                     {% endfor %}
                 </tbody>
@@ -76,6 +88,49 @@
                 <button type="submit" name="action" value="save" class="btn btn-success">Speichern & Zur Kasse</button>
             </div>
         </form>
+
+        <form method="post" class="bg-white p-4 shadow-sm rounded mt-4">
+            <input type="hidden" name="action" value="add_product">
+            <h5 class="mb-3">Neuer Artikel hinzufügen</h5>
+            <div class="form-row align-items-end">
+                <div class="form-group col-md-3">
+                    <label for="add_name">Name</label>
+                    <input type="text" class="form-control" name="add_name" id="add_name" required
+                        placeholder="z.B. 500g Brombeeren">
+                </div>
+                <div class="form-group col-md-2">
+                    <label for="add_price">Preis (€)</label>
+                    <input type="text" inputmode="decimal" class="form-control" name="add_price" id="add_price" required
+                        placeholder="4,50">
+                </div>
+                <div class="form-group col-md-1">
+                    <label for="add_icon">Icon</label>
+                    <input type="text" class="form-control" name="add_icon" id="add_icon" placeholder="🫐"
+                        maxlength="4">
+                </div>
+                <div class="form-group col-md-2">
+                    <label for="add_color">Farbe</label>
+                    <select class="form-control" name="add_color" id="add_color">
+                        <option value="btn-primary">Blau</option>
+                        <option value="btn-secondary">Grau</option>
+                        <option value="btn-success">Grün</option>
+                        <option value="btn-danger">Rot</option>
+                        <option value="btn-warning">Gelb</option>
+                        <option value="btn-info">Hellblau</option>
+                        <option value="btn-dark">Schwarz</option>
+                    </select>
+                </div>
+                <div class="form-group col-md-2">
+                    <button type="submit" class="btn btn-primary">Artikel hinzufügen</button>
+                </div>
+            </div>
+        </form>
+
+        <div class="mt-4 text-center text-muted pb-4">
+            <small>Made with ♥️, marmalade and zero knowledge in <a href="https://kiel-sailing-city.de/"
+                    target="_blank">Kiel Strawberry City.</a><br>
+                Version: {{ version }}, Instanz: {{ instance_id[:8] }}...</small>
+        </div>
     </div>
     <script>
         if ('serviceWorker' in navigator) {

templates/index.html

@@ -12,137 +12,162 @@
     <link rel="manifest" href="/manifest.json">
     <meta name="theme-color" content="#dc3545">
     <link rel="apple-touch-icon" href="/static/icon-192x192.png">
+    <script defer data-domain="erdbeerhannah.elpatron.me" src="https://plausible.elpatron.me/js/script.js"></script>
     <style>
         body,
         html {
             height: 100%;
+            margin: 0;
         }
 
-        .table-container {
+        .kasse-container {
-            height: 100%;
+            height: 100vh;
             display: flex;
+            flex-direction: column;
+            min-height: 0;
+        }
+
+        .kasse-header {
+            flex-shrink: 0;
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            padding: 0.5rem 1rem;
+            font-weight: bold;
+            font-size: 1.5rem;
+        }
+
+        .article-grid {
+            flex: 1;
+            min-height: 0;
+            display: grid;
+            grid-template-columns: repeat({{ grid_cols }}, 1fr);
+            grid-template-rows: repeat({{ grid_rows }}, 1fr);
+            gap: 4px;
+            padding: 4px;
+        }
+
+        .article-tile {
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            min-height: 0;
+        }
+
+        .article-tile .btn {
+            width: 100%;
+            height: 100%;
+            white-space: normal;
+            font-size: clamp(0.9rem, 4vw, 1.5rem);
+            padding: 0.5rem;
+            display: flex;
+            flex-direction: column;
             align-items: center;
             justify-content: center;
         }
 
-        .table {
+        .article-tile .btn .article-icon {
-            width: 100%;
+            font-size: min(12vw, 11vh);
-            height: 100%;
+            line-height: 1.1;
-            table-layout: fixed;
+            margin-bottom: 0.25rem;
         }
 
-        .table td {
+        .kasse-sum-row {
-            height: calc(100vh / 6);
+            flex-shrink: 0;
-            vertical-align: middle;
+            display: flex;
-            text-align: center;
+            align-items: center;
-        }
+            justify-content: space-around;
-
+            padding: 0.5rem;
-        .btn {
-            width: 100%;
-            height: 100%;
-            white-space: normal;
-        }
-
-        .bold-row {
             font-weight: bold;
-            font-size: 250%;
+            font-size: 1.5rem;
         }
 
-        .custom-btn-size {
+        .kasse-reset {
-            font-size: 180%;
+            flex-shrink: 0;
+            padding: 0.5rem;
         }
 
-        .custom-btn-size-med {
+        .kasse-footer {
-            font-size: 150%;
+            flex-shrink: 0;
+            padding: 0.5rem;
+            text-align: center;
+            font-size: 0.9rem;
         }
 
         .input-container {
             display: flex;
             flex-direction: column;
             align-items: center;
-            justify-content: center;
+            gap: 0.25rem;
-            height: 100%;
         }
 
         .input-container input {
-            margin-bottom: 10px;
-            width: 80%;
             text-align: center;
-            font-size: 1.5rem;
+            font-size: 1.2rem;
+            width: 120px;
         }
 
-        .input-container button {
+        .empty-state {
-            width: 80%;
+            grid-column: 1 / -1;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            text-align: center;
+            padding: 2rem;
+            color: #6c757d;
         }
     </style>
 </head>
 
 <body>
-    <div class="container-fluid table-container">
+    <form method="post" class="kasse-container container-fluid">
-        <table class="table table-bordered">
+        <div class="kasse-header">
-            <form method="post">
+            <span>erdbeerrechner 🍓💶</span>
-                <tbody>
+            <a href="{{ url_for('admin', instance_id=instance_id) }}"
-                    <tr class="bold-row">
+                class="btn btn-outline-secondary">⚙️ Setup</a>
-                        <td colspan="2">erdbeerrechner 🍓💶</td>
+        </div>
-                        <td><a href="{{ url_for('admin', instance_id=instance_id) }}"
+
-                                class="btn btn-outline-secondary custom-btn-size-med">⚙️ Setup</a></td>
+        <div class="article-grid">
-                    </tr>
+            {% if not products %}
-                    <tr>
+            <div class="empty-state">
-                        {% for i in range(1, 4) %}
+                Keine Artikel. Bitte im <a href="{{ url_for('admin', instance_id=instance_id) }}">Admin</a> hinzufügen.
-                        {% set prod = products[i] %}
+            </div>
-                        <td>
+            {% else %}
-                            <button type="submit" name="position" value="{{ i }}" title="{{ prod['name'] }}"
+            {% for pos, prod in products|dictsort %}
-                                class="btn btn-xl {{ prod['color_class'] }} custom-btn-size">
+            <div class="article-tile">
-                                {{ prod['icon'] }} <br> {{ '{:,.2f}'.format(prod['price']).replace('.', ',') }}€ <br>
+                <button type="submit" name="position" value="{{ pos }}" title="{{ prod['name'] }}"
-                                ({{ items[i] }})
+                    class="btn {{ prod['color_class'] }}">
+                    <span class="article-icon">{{ prod['icon'] }}</span>
+                    <span>{{ '{:,.2f}'.format(prod['price']).replace('.', ',') }}€</span>
+                    <span>({{ items.get(pos, 0) }})</span>
                 </button>
-                        </td>
+            </div>
             {% endfor %}
-                    </tr>
+            {% endif %}
-                    <tr>
+        </div>
-                        {% for i in range(4, 7) %}
+
-                        {% set prod = products[i] %}
+        <div class="kasse-sum-row">
-                        <td>
+            <span title="Summe">🫰 {{ gesamtwert.replace('.', ',') }}€</span>
-                            <button type="submit" name="position" value="{{ i }}" title="{{ prod['name'] }}"
-                                class="btn btn-xl {{ prod['color_class'] }} custom-btn-size">
-                                {{ prod['icon'] }} <br> {{ '{:,.2f}'.format(prod['price']).replace('.', ',') }}€ <br>
-                                ({{ items[i] }})
-                            </button>
-                        </td>
-                        {% endfor %}
-                    </tr>
-                    <tr>
-                        <td title="Summe" class="bold-row">🫰 {{ gesamtwert.replace('.', ',') }}€</td>
-                        <td>
             <div class="input-container">
                 <input type="number" step="0.01" class="form-control" name="given"
                     placeholder="{{ given }}" value="{% if given != '0' %}{{ given }}{% endif %}">
                 <button type="submit" name="action" value="calculate_change"
-                                    title="Wechselgeld berechnen" class="btn btn-xl btn-primary custom-btn-size-med">🧾
+                    title="Wechselgeld berechnen" class="btn btn-primary btn-sm">🧾 Berechnen</button>
-                                    Berechnen</button>
             </div>
-                        </td>
+            <span title="Wechselgeld" class="{{ background }}">🪙 {{ change.replace('.', ',') }}€</span>
-                        <td title="Wechselgeld" class="bold-row {{ background }}">🪙 {{ change.replace('.', ',') }}€
+        </div>
-                        </td>
+
-                    </tr>
+        <div class="kasse-reset">
-                    <tr>
+            <button type="submit" name="action" value="reset" class="btn btn-dark btn-block">Reset 🦭</button>
-                        <td colspan="3">
+        </div>
-                            <button type="submit" name="action" value="reset" id="reset"
+
-                                class="btn btn-xl btn-dark custom-btn-size">Reset 🦭</button>
+        <div class="kasse-footer">
-                        </td>
+            Made with ♥️, marmalade and zero knowledge in <a href="https://kiel-sailing-city.de/"
-                    </tr>
+                target="_blank">Kiel Strawberry City.</a><br>
-                    <tr>
-                        <td colspan="3">Made with ♥️, marmalade and zero knowledge in <a
-                                href="https://kiel-sailing-city.de/" target="_blank">Kiel Strawberry City.</a><br>
             Version: {{ version }}, Instanz: {{ instance_id[:8] }}...
-                            <button type="button" onclick="shareInstance()"
+            <button type="button" onclick="shareInstance()" class="btn btn-sm btn-outline-primary ml-2">📤 URL Teilen</button>
-                                class="btn btn-sm btn-outline-primary ml-2">📤 URL Teilen</button>
-                        </td>
-                    </tr>
-                </tbody>
-            </form>
-        </table>
         </div>
+    </form>
     <script>
         if ('serviceWorker' in navigator) {
             window.addEventListener('load', () => {

templates/landing.html

@@ -25,6 +25,7 @@
     <link rel="manifest" href="/manifest.json">
     <meta name="theme-color" content="#dc3545">
     <link rel="apple-touch-icon" href="/static/icon-192x192.png">
+    <script defer data-domain="erdbeerhannah.elpatron.me" src="https://plausible.elpatron.me/js/script.js"></script>
 </head>
 
 <body>
@@ -45,8 +46,10 @@
             <ul class="list-group shadow-sm" id="saved-instances-list">
             </ul>
         </div>
-        <div class="mt-5 text-muted">
+        <div class="mt-5 text-muted pb-4">
-            <small>Version: {{ version }}</small>
+            <small>Made with ♥️, marmalade and zero knowledge in <a href="https://kiel-sailing-city.de/"
+                    target="_blank">Kiel Strawberry City.</a><br>
+                Version: {{ version }}</small>
         </div>
     </div>
     <script>

templates/login.html

@@ -9,6 +9,7 @@
     <link rel="manifest" href="/manifest.json">
     <meta name="theme-color" content="#dc3545">
     <link rel="apple-touch-icon" href="/static/icon-192x192.png">
+    <script defer data-domain="erdbeerhannah.elpatron.me" src="https://plausible.elpatron.me/js/script.js"></script>
 </head>
 
 <body class="bg-light">
@@ -21,14 +22,19 @@
 
         <form method="post" class="bg-white p-4 shadow-sm rounded">
             <div class="form-group">
-                <label for="admin_password">Passworteingabe erforderlich</label>
+                <label for="admin_password">Passwort (bei passwortloser Kasse leer lassen)</label>
-                <input type="password" class="form-control" name="admin_password" id="admin_password" required
+                <input type="password" class="form-control" name="admin_password" id="admin_password"
-                    autofocus>
+                    autofocus placeholder="Leer lassen wenn keine Kasse mit Passwort">
             </div>
             <button type="submit" class="btn btn-primary w-100">Einloggen</button>
             <a href="{{ url_for('index', instance_id=instance_id) }}" class="btn btn-secondary w-100 mt-2">Zurück zur
                 Kasse</a>
         </form>
+        <div class="mt-4 text-center text-muted pb-4">
+            <small>Made with ♥️, marmalade and zero knowledge in <a href="https://kiel-sailing-city.de/"
+                    target="_blank">Kiel Strawberry City.</a><br>
+                Version: {{ version }}, Instanz: {{ instance_id[:8] }}...</small>
+        </div>
     </div>
     <script>
         if ('serviceWorker' in navigator) {