Server Administration > Item Fields > Customizing Rich Content Fields > CSS Definitions
CSS Definitions
Each CSS file consists of a single HTML style element, which is a subset of the CSS 1.0 specification. The <body> element defines base styles to be applied to the rich content field; however, styles for supported HTML elements may also be defined. Regular or class styles cannot be defined, specifically:
no generic (.foo { color: green; }) or regular classes ( {color: green;})
no ID based selectors (#1234 { color: green; })
no pseudo-classes (A:link { color: red}) or pseudo-elements (P:first-line { font-variant: small-caps})