I'm unable to serve static content from static_dir (css). when I visited the URL http://srvc1.appeng-vj.appspot.com/styles/index.htmll I get 404 Page Not Found error... I had expected the static content, index.html, from static_dir css should have been served as per app.yaml handlers!
app.yaml as follows:
runtime: python
env: flex
runtime_config:
python_version: 3
handlers:
- url: /styles
static_dir: css
- url: /s1/
script: home.application
entrypoint: gunicorn -b :$PORT m1:application
service: srvc1
app root directory structure is as follows (attach screenshot)

Thanks for any clue what might be wrong here !