excalidraw/src/components/GitHubCorner.tsx

import React from "react";
import oc from "open-color";

// https://github.com/tholman/github-corners
export const GitHubCorner = React.memo(() => (
  <svg
    xmlns="http://www.w3.org/2000/svg"
    width="40"
    height="40"
    viewBox="0 0 250 250"
    className="github-corner rtl-mirror"
  >
    <a
      href="https://github.com/excalidraw/excalidraw"
      target="_blank"
      rel="noopener noreferrer"
      aria-label="GitHub repository"
    >
      <path d="M0 0l115 115h15l12 27 108 108V0z" fill={oc.gray[6]} />
      <path
        className="octo-arm"
        d="M128 109c-15-9-9-19-9-19 3-7 2-11 2-11-1-7 3-2 3-2 4 5 2 11 2 11-3 10 5 15 9 16"
        style={{ transformOrigin: "130px 106px" }}
        fill={oc.white}
      />
      <path
        className="octo-body"
        d="M115 115s4 2 5 0l14-14c3-2 6-3 8-3-8-11-15-24 2-41 5-5 10-7 16-7 1-2 3-7 12-11 0 0 5 3 7 16 4 2 8 5 12 9s7 8 9 12c14 3 17 7 17 7-4 8-9 11-11 11 0 6-2 11-7 16-16 16-30 10-41 2 0 3-1 7-5 11l-12 11c-1 1 1 5 1 5z"
        fill={oc.white}
      />
    </a>
  </svg>
));