dark mode for github gist

index.tsx

import React from 'react';
import useDarkMode from './useDarkMode';

const GitHubGist = props => {
  const [theme] = useDarkMode();
  const darkStyle = theme === 'dark'
    ? { filter: 'inverse(100%) hue-rotate(180deg)' }
    : {}

  return <iframe {...props} css={darkStyle} />
}