Welcome, Ethan !

import { Group, Button, MantineProvider, createTheme } from '@mantine/core';
import classes from './Demo.module.css';

const theme = createTheme({
  components: {
    Button: Button.extend({
      classNames: classes,
    }),
  },
});

function Demo() {
  return (
    <MantineProvider theme={theme}>
      <Group>
        <Button variant="danger">Danger variant</Button>
        <Button variant="primary">Primary variant</Button>
      </Group>
    </MantineProvider>
  );
}