title: Can I change the WebKit CSS rules in my browser?
body: <p>For the occasional late-night computing session, I like to tone done the colors of the sites I'm using for the sake of retaining my eyesight. My typical go-to extension is Stylish, a useful tool that loads custom CSS in webpages.</p>
  
  <p>Curiosity and tampering led to the question I have here. Can I change WebKit's CSS defaults in WebKit's tags to better suit my needs? I'm speaking in regards to custom browser CSS rules, those used in Safari and Chrome for <code>-webkit-</code>, and others for other browsers. Is there any plain-text file that helps define these rules, which would allow me to edit them and therefore tamper with browser-loaded defaults?</p>