Card base CSS design tweaks
Card base CSS design tweaks

Some tweaks to improve the card base CSS
- deleted base font size
- &__title, &__synopsis, and &__context font/colors defined
- deleted responsive styling

https://phabricator.endlessm.com/T15932

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib