Different properties in CSS allow for the seamless creation of a website background. The combination of background-color, background-image, background-repeat, and background-position CSS properties allows us to create visually appealing backgrounds for HTML elements. The background-color sets the base color of an element, while background-image allows the use of an image to act as a background. The background-repeat property controls whether the background image should repeat and in what direction, with options like no-repeat to prevent repetition. The background-position specifies the initial placement of the background image.