How To Change the Color of My Browsers Background Safari I use Safari version 9.1.1.  I'm looking to make it easier to read my browser by changing the color of the background and text, however there is no option to do so that I can find in the settings panel.  Is this something I can change? Or would this require knowledge of coding?
You can invert colors from System Preferences -> Accessibility. As mentioned in your comments, a webpage's background is in control of the developer/webmaster.