Obsess Blue V2.0 Website Black background change

[Curshad]

Hey can someone help me ?

I am lookin to change

/* regular */
body
{
 margin: 0px;
 padding: 0px;
 font-size: 12px;
 font-family: Arial;
 background-color: Black; <<<<<<<< THIS
}
img
{
 border: 0px;
}
.size
{
 width: 950px;
 margin: 0px auto;
}

TO THIS

>>>>>>>>>>>>> http://lohrman.com/s...spanish-sky.jpg <<<<<<<<<<<<<<<<<

How do i do it?

I've tried this

background-image: -webkit-gradient(
linear,
left bottom,
left top,
color-stop(0, rgb(194,236,255)),
color-stop(0.71, rgb(20,145,255)),
color-stop(1, rgb(0,115,255))
);

but it doesn't work.