how do i change this html to center the background pic?

[Goldaline]

this is where i change the link to the background pic, but i can't center the image. can you help me?

body {font-family: {font:Text}; font-size: 12px; color: {color:Font}; background-color:
{color:Background}; background-image:url("http://www.deviantart.com/download/67767115/SAN_2007___cotton_candy__t_001_by_Ayelie_stock.jpg"); background-attachment: fixed;}