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How to solve Magento 2 “Refuse to apply css because of its MIME type” on Nginx?

I have a Magento 2 store and everything was ok with the default theme. Then I installed Porto theme and now I get this errors in the console and the page (especially the top menu) doesn’t load properly:

The Content-Security-Policy directive ‘frame-ancestors’ does not support the source expression ”unsafe-inline”

Refused to apply style from ‘’ because its MIME type (‘text/html’) is not a supported stylesheet MIME type, and strict MIME checking is enabled.

As a web server I’m using Nginx.

I tried running this commands after theme installation but I’m still getting the same errors:

php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy -f
php bin/magento indexer:reindex
php bin/magento cache:flush

Any ideas on what I could further do to fix this?

Thank you!

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