index.js

import React from 'react';

/*
  A small React wrapper around http://tholman.com/github-corners/

  url - the URL of your project
  backgroundColor - (default black) the background color of the corner
  color - (default white) the color of the octocat
  svgStyle - (default {}) override the style of the SVG.
  target - (default "_self") override the target attribute of the link
*/
const GithubCorner = (props) => {
  const {backgroundColor, color, svgStyle, target, url} = props
  const style = {
    border: 0,
    color: color,
    fill: backgroundColor,
    position: 'absolute',
    right: 0,
    top: 0,
    ...svgStyle
  }

  return (
    <a href={url} className="GithubCorner" rel="noopener" target={target} aria-label="View source on Github">
      <svg className="GithubCorner__svg" viewBox="0 0 250 250" style={style} aria-hidden="true">
        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
        <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill={color} style={{transformOrigin: '130px 106px'}} className="GithubCorner__octo-arm"></path>
        <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill={color} className="GithubCorner__octo-body"></path>
      </svg>
    </a>
  )
}

GithubCorner.defaultProps = {
  backgroundColor: "black",
  color: "white",
  svgStyle: {},
  target: "_self"
}

module.exports = GithubCorner