'Flask relative path to css for sub Apps

i would like to ask you how to figure out paht fot static folder for sub apps in Flask. I have one pool OpenCv with two apps (App1 and App2). Both apps working fine, i can load templates without any problems, but struggle with css. I tried many was but without any results. Just if static folder in in pool level (OpenCv) then css works. Thx for any help

app.py

from flask import *  
app = Flask(__name__)  
 
@app.route('/App2/')
def home():  
      return render_template('index.html')  
if __name__ == '__main__':  
   app.run(debug = True,threaded=True )

index.html

<html>  
<head>  
    <meta charset="UTF-8">
    <title>Message</title>  
    <link rel="stylesheet" href="{{ url_for('static', filename='App2/static/css/style.css') }}">  
</head>  
   
<body>  
    <h1>app2</h1>  
</body>  
</html>

IIS structure as img

python-3.x flask

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'Flask relative path to css for sub Apps

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