Why Isn\'t My External CSS File Loading in My Flask Application?

CSS File Not Loading in Flask

Q: I'm trying to use an external CSS file to style my Flask template, but the styles aren't being applied. Here's my file structure:

/app
    - app_runner.py
    /services
        - app.py 
    /templates
        - mainpage.html
    /styles
        - mainpage.css

mainpage.html

    
        <link rel="stylesheet" type="text/css" href="../styles/mainpage.css">
    
    
        <!-- content --> 

A: To resolve this issue, you need to have a dedicated 'static' folder for storing your CSS and JS files. Here's the corrected file structure:

/app
    - app_runner.py
    /services
        - app.py 
    /templates
        - mainpage.html
    /static
        /styles
            - mainpage.css

mainpage.html

    
        <link rel="stylesheet" type="text/css" href="%7B%7B%20url_for('static',filename='styles/mainpage.css')%20%7D%7D">
    
    
        <!-- content --> 

Flask will now look for the CSS file under static/styles/mainpage.css.

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