First, install the npm package using the following:
npm install @sebgroup/react-components --save
These components uses SEB Bootstrap for styling and relies on its styles, fonts, colors and variables. You will need to install the SEB Bootstrap package as well to get it to work.
npm install @sebgroup/bootstrap --save
Then make sure you import SEB Bootstrap in your root styles files:
@import "~@sebgroup/bootstrap/scss/bootstrap";