.my-class {
	background-image: url(wimg('a-test-image.jpg'));
}

#my-id {
	background: rgba(100, 200, 45) center cover url(img('another-image.png'));
}

.another-class {
	background: url(at('foobar.jpg'));
}

#another-id {
	background: url(at2('barfoo.png'));
}