Use the `background-image` property
Example: `background-image: url(“image.jpg”);`
Apply it to the desired selector, such as `body`, `div`, or `.class`
Example: `body { background-image: url(“background.jpg”); }`
Use `background-repeat: no-repeat;` to prevent tiling
Use `background-size: cover;` to make the image fill the element
Use `background-position: center;` to center the image
Use `background-attachment: fixed;` to keep the image fixed while scrolling
Use the shorthand `background` property if needed
Example: `background: url(“image.jpg”) no-repeat center center / cover;`