Every CSS declaration includes a property / value pair. Depending on the property, the value can include a single integer or keyword, To a series of keywords and values with or without units. There are a common set of data types — values and units — that CSS properties accept. Below is an overview of most of these data types. Refer To the page for each value type for more detailed information....wanted to include a background image, you might use either of the...css .box { background-image: url("images/my-background.png");...