I'm new to Drupal. I've just started a custom theme in Drupal 8 and created a new field under Content Type. This field value is a custom class for each page. From the documentation I should be able to display the field contents of "field_body_class" with the following, neither of which display.
{{content.field_body_class}}
{{page.content.field_body_class}}
I've checked to make sure the field was not hidden, which it was not.