Background image but not to repeat when I scroll.

Hello,
I want to use a picture as background but not to repeat when I scroll.
I have addded the following code in Styling option but is not working. What is the error?

html, body {
background: www.sifidape.gr/wp-content/uploads/2013/06/bg2.jpg no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}

 

Hello,

You are using wrong code.
Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

html, body {
background: url(http://www.sifidape.gr/wp-content/uploads/2013/06/bg2.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}