Before You started to use this You have to import this one sentence import 'semantic-ui-css/semantic.min.css'; aAnd npm or yarn add yarn add semantic-ui-react yarn add semantic-ui-css Now you can use semanticUI This is a semanticUI site If you wanna How to use this Visite this site Get Started - Semantic UI React Semantic UI React provides React components while Semantic UI provides themes as CS..