InvokeAI/invokeai/frontend/web/src/mantine-theme/theme.ts

import { MantineThemeOverride } from '@mantine/core';
import { useMemo } from 'react';

export const useMantineTheme = () => {
  const mantineTheme: MantineThemeOverride = useMemo(
    () => ({
      colorScheme: 'dark',
      fontFamily: `'Inter Variable', sans-serif`,
      components: {
        ScrollArea: {
          defaultProps: {
            scrollbarSize: 10,
          },
          styles: {
            scrollbar: {
              '&:hover': {
                backgroundColor: 'var(--invokeai-colors-baseAlpha-300)',
              },
            },
            thumb: {
              backgroundColor: 'var(--invokeai-colors-baseAlpha-300)',
            },
          },
        },
      },
    }),
    []
  );

  return mantineTheme;
};