By using the background (shorthand) property.
The background shorthand CSS property sets all background style properties at once, such as color, image, origin and size, or repeat method.
This property is a shorthand for the following CSS properties (is recommended order):
background-imagebackground-positionbackground-sizebackground-repeatbackground-attachmentbackground-originbackground-clipbackground-color
body {
background:
url(sweettexture.jpg) /* image */
top center / 200px 200px /* position / size */
no-repeat /* repeat */
fixed /* attachment */
padding-box /* origin */
content-box /* clip */
red; /* color */
}