I created a custom theme, that inherits from magento/blank theme. And I am able to override and extend css classes that are defined in
using the "Adding structured changes" section in the documentation (http://devdocs.magento.com/guides/v2.1/frontend-dev-guide/css-guide/css_quick_guide_approach.html).
However, the property I want to change is defined in
overriding the class in my _module_extend.less doesn't work.
What is the right magento way to do that?