How to make a website appear darker

Ever wanted to turn a bright colored website into something a little bit easier on the eyes?

With google chrome its incredibly easy.

• Open the Console with CTRL+SHIFT+C
• Press TAB Ten times  in order to focus on the code entry area
  (You will see a blinking cursor on the right if you look carefully)
• Use  CTRL+V  to paste the code below and press ENTER

 var b = document.querySelectorAll("div");
 for (var i=0; i<b.length; i++) {
    b[i].style.backgroundColor = "black"; 
    b[i].style.color = "white"; 
 }