help with a background image with the Urban artist Theme

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Hi I am a new concrete5 user from Holland. I made my band site with this great CMS, The only thing is I want to add a background image to the site :

http://www.airbagmusic.nl/Newsite/index.php...

The theme is : Urban artist

I would like to put an image similar to this:

http://www.nasa.gov/images/content/161862main_hinode_sun_2502x2649....

behind the content so that the two halves come out the sides of the central content block...

I have noooo experience with CSS but I'm a quick learner. If anyone here could help me we would really appreciate it

Thanks in advance

Airbag

KaiBergin
 
vincedelaking replied on at Permalink Reply
vincedelaking
There are lot's off ways to get this to work.
For example check this article:http://css-tricks.com/3458-perfect-full-page-background-image/...
Or do a Google on 'full background image css'.
Hope this helps, succes met je band ouwe.
KaiBergin replied on at Permalink Reply
KaiBergin
Thanks (dank)

Ok, so I just added this css to the main.css file in the packages/urban artist directory:

html {
background: url(images/bg.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}

but no joy...or am I using the wrong css file..hope you can help.