If you have multiple CSS definitions to be applied to the same HTML tag, you can write them together delimited with semicolon (;). The following CSS provides you a good example of CSS definition groups:pre.code {background-color: #efefef; width: 502px; margin: 4px; padding: 4px}The above CSS code is identical to the following CSS code:pre.code {background-color: #efefef}pre.code {width: 502px}pre.code {margin: 4px}pre.code {padding: 4px}