A very, very tiny minimum amount of CSS knowledge you need or none. As long as a CSS framework could covering all the necessary features to build a full-fledged UI. Maybe using CSS when to solve something tricky that a CSS framework couldn't do. Yea... You don't need it (CSS).
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
A very, very tiny minimum amount of CSS knowledge you need or none. As long as a CSS framework could covering all the necessary features to build a full-fledged UI. Maybe using CSS when to solve something tricky that a CSS framework couldn't do. Yea... You don't need it (CSS).