Hacker News tweaks: save as hn.user.js, drop on chrome://extensions page.

hn.user.js

// ==UserScript==
// @match https://news.ycombinator.com/*
// ==/UserScript==

(function () {
  document.body.style.backgroundColor = "#f6f6ef";
  var s = document.createElement('style');
  s.innerText = "td.default {max-width: 40em; } "+ 
                "body { background-color: #f6f6ef; } "+ 
                ".comment { font-size: 12px; } "+ 
                ".votearrow:before { content: '▲'; line-height: 1.2; font-size: 80%; } "+ 
                ".votearrow { background: inherit !important; color: grey; }";
  document.head.appendChild(s);
})()