Refused to apply style from 'http://localhost:9000/account/activate/content/css/loading.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled. code example
Example: stylesheet not loaded because of mime-type
put your .css file in a folder called public
in your app.js file add the following code:
app.use(express.static('public'));