Is there a way to disable a magazine's custom CSS?
I subscribed to a magazine that, in the last day, has changed over to an unreadable custom CSS that goes so far as to break site gizmos; no matter my theme choice, their custom CSS overrides my setting.
Depending on your device+browser, there might be a browser add-on named "grease monkey" or a similar alternative available that allows you to customize the page. You mileage may vary with your coding proficiency.