user script to improve readability and night mode for hackers news

hackers-news.users.js

// ==UserScript==
// @name         hackers-news
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  improve readability and night mode for hackers news
// @author       You
// @match        https://news.ycombinator.com/item?id=*
// @match        https://news.ycombinator.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...
    let style = document.createElement('style');
    style.textContent = `
body > center > table {
  max-width: 40em
}
a,td,.comment {
  font-size: 1.25em;
  line-height: 1.6;
}
`;
    function isNight() {
      return true // TODO use the clock to determine
    }
    if (isNight()) {
        style.textContent += `
body {
  filter: invert(100%);
  background: black;
}
*, .c00 {
  color: #333;
}

/* the header */
td[bgcolor] {
  background: white;
}
`
    }
    document.body.append(style);
})();