CSS syntax error in tag style amp-custom – invalid declaration.

Hello, im having problems with the following message error that appears over 40 posts in my blog : “CSS syntax error in tag style amp-custom – invalid declaration.”

I’ve searched a lot about it and none of the solutions that worked for others worked for me. Any chance anyone know why this is happening ?

Link for one example of my posts that are showing me the error message: https://www.tenda.com/blog/decoracao/18-dicas-incriveis-de-decoracao-de-apartamentos-pequenos/amp/

The page I need help with: [log in to see the link]