Body not aligned

Hi,

I am using the “Complete” theme by AJ Clarke and have an issue with the background image not showing up properly. Also, as the width of the page is set to 1020px, there is a slight overflow on all the screens, can anyone please help me get the layout right the code that i have modified is as follows:

body {
    background: url('image-url') 0 50% repeat-y #ffffff;
    font-family: Arial,Helvetica,sans-serif;
    font-size: 12px;
    line-height: 1.7em;
    letter-spacing: 0.5px;
    color: #666;
    width:1020px;
    margin: auto;
    overflow: scroll;
}

(Plz ignore the url path given)
the background image is 1280px wide- i have used various iterations of the image from 1020 to 1280 but still the body starts from extreme left of the screen and the background image starts around 30px after

Also,if I dont use the overflow:scroll option then the content is not visible on the sides

Can anyone plz help me out in getting it aligned?

Thanks and Regards