title: How to inject CSS into webpage through Chrome extension?
body: <p>I do not know how to inject CSS into a webpage through a Chrome extension. I am trying to inject this into a web page:</p>
  
  <pre><code>body {
     background: #000 !important;
  }
  
  a {
     color: #777 !important;
  }
  </code></pre>
  
  <p>Here is my manifest.json:</p>
  
  <pre><code>{
  "update_url":"http://clients2.google.com/service/update2/crx",
    "name": "Test Extension",
    "version": "1.0",
    "description": "This is a test extension for Google Chrome.",
    "icons": { "16": "icon16.png",
             "48": "icon48.png",
            "128": "icon128.png" },
    "background_page": "background.html",
    "browser_action": {
      "default_icon": "icon19.png"
    },
    "content_scripts": [
      {
        "matches": ["http://test-website.com/*"], 
        "js": ["js/content-script.js"]
      }
    ],
  
      "permissions": [ "tabs", "http://test-website.com/*" ]
  
  }
  </code></pre>