Override Chrome selection background color

Have you ever noticed that some of the  cool well designed website have their selection background color according to theme of the website. For example if a website using green color for most of its design will show the green color when you select text  on website.  Here is a website http://www.impressivewebs.com/ if you select text on this website then it will show light brown color as background of selected text. You can do this with single line of CSS using CSS3 ::selection pseudo class. Put the following line in chrome’s user style custom.css file which is located at ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css  on mac.

::selection {
  background: teal; /* -webkit browser*/