how to style background images in css code example

Example 1: make image background of div

background-image: url("photographer.jpg");

Example 2: add background image in css

.w {
background-image: url("images/tom1.png");
}

.a {
background-image: url("images/tom2.png");
}

.s {
background-image: url("images/tom3.png");
}