Some of the most widely used CSS properties are the background-related properties; with which you can define how the background of various elements is displayed.
With these properties you can set the color or the image displayed as the background. In addition, you have control over the position, the repetition type (horizontal, vertical, both or neither) of the image. Furthermore, you can set whether the image should scroll with the contents or should stay in a fixed position during scrolling. In this article, you can see these functionalities demonstrated in examples among other things.