CSS redirects here.
Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a web page. While the W3C CSS Working Group has produced dozens of CSS-related specifications (whose most recent version is CSS 4), CSS 2.1 is (after over a dozen years of drafts) still the only entirely reliable basis for styling web pages.
From the CSS 2.1 Recommendation:
A CSS stylesheet is a text (human-readable) document composed from one or more CSS rules. A CSS rule is at its most basic rather simple, composed of a selector and one or more assigned style properties. For example, the following rule styles all HTML paragraphs with a 'class' attribute containing the value "hilight" (i.e., "<p class='hilight'>Outside of a dog...</p>") to having a left margin of 16 pixels and a 'MidnightBlue' font color. Colors in HTML can be specified various ways, either as HTML Colour Names such as "MidnightBlue", RGB ("rgb(25,25,112)") or hexadecimal ("#191970") values. Because only a few color names are reliably supported by all browsers it is safer to use an RGB or hexadecimal value.
p.hilight { margin-left: 16px ; color : #191970 }
where the selector is "p.hilight", the assigned properties of "margin-left: 16px" and "color : #191970".
JSPWiki permits direct input of CSS styles using wiki markup. The above example can be accomplished directly on a wiki page using the following markup:
%%(margin-left: 16px ; color : #191970) Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read. — Groucho Marx %%
This would appear as: