How do I set a image to the entire webform in CSS

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C#

ASP.NET

i am able to keep the image in the specified location (center right left) but i want the whole page as a single image background

What I have tried:

body, #Button1, #Button2, #Button3 {
background-image:url('Colour-qoutes-box.jpg');
background-repeat:no-repeat;
background-attachment:fixed;
font-family: Gabriola;
font-size: large;
font-style: italic;
table-layout: auto;
border-collapse: collapse;
border-spacing: inherit;
empty-cells: hide;
font-weight: bold;
}