Site:
body {
background-image:url(‘background.jpg’);
}
Single Page:
body.page-id-78 {
background-image:url(‘background.jpg’);
}
Several Pages:
body.page-id-78, body.page-id-79, body.page-id-82 {
background-image:url(‘background.jpg’);
}
Single Category:
.category-CatName {
background-image:url(‘background.jpg’);
}
Multiple Categories:
.category-CatName1, .category-CatName-2 {
background-image:url(‘background.jpg’);
}
Archive Pages:
.archive {
background-image:url(‘background.jpg’);
}
Custom Template, Post or Category:
.page-template-name {
background-image:url(‘background.jpg’);
}