Website Background as an image stored in a directory

[Kunal100]

Hi
I am new to prestashop and am attempting the large task of redesigning my
url http://www.easterninspiration.co.uk
I have a background image in a folder Img in the root directory of my website directory and I want this image to appear on my background of my site How can I do this as I am new to css Here is my file global.css file my Body tag is as follows:
body {
background url:http://www.easterninspiration.co.uk/Img/Back.jpg;
repeat-x;
background-attachment:fixed;
background-repeat: no-repeat;
font-size: 11px;
font-family: Arial, Helvetica, Sans-Serif;
text-align: left;
}

I really don't know how to get this working any help would be greatly appreciated Thanks.

Kunal